curl/curl
Sep 2024 – May 2026
21 Months active
Languages Used
CPerlPythonShellXMLYAMLCMakeMarkdown
Technical Skills
C programmingCI/CDConcurrency handlingDebuggingFTP protocol handlingHTTP protocol handling
Stefan Eissing
PROFILE
Stefan Eissing
Over 21 months, this developer delivered core networking, protocol, and security features for the curl/curl repository, focusing on reliability, performance, and maintainability. They engineered enhancements across HTTP/2, HTTP/3, QUIC, and TLS, modernizing connection management, DNS resolution, and authentication flows. Their work included refactoring multi-interface APIs, implementing asynchronous programming models, and strengthening test infrastructure for CI stability. Using C, Python, and OpenSSL, they improved memory management, concurrency, and error handling, while reducing latency and failure modes in high-load scenarios. Their contributions enabled safer, faster, and more predictable network transfers, supporting robust cross-platform deployments and streamlined developer workflows.
Overall Statistics
Feature vs Bugs
48%Features
Repository Contributions
541Total
Bugs
193
Commits
541
Features
175
Lines of code
117,042
Activity Months21
Your Network
215 peopleShared Repositories
215
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Work History
May 2026
10 Commits • 3 Features
May 1, 2026May 2026 monthly summary for curl/curl: Delivered architectural and security-focused enhancements across core networking, authentication, and TLS layers; improved performance by eliminating blocking DNS work and tightening STARTTLS reuse; overhauled credential management with refcounted credentials and SASL service name; strengthened UNIX domain socket handling; fixed wakeup loop issues to boost event loop robustness; overall impact includes improved reliability, security, and developer clarity across the codebase.
10 Commits • 3 Features
May 1, 2026May 2026 monthly summary for curl/curl: Delivered architectural and security-focused enhancements across core networking, authentication, and TLS layers; improved performance by eliminating blocking DNS work and tightening STARTTLS reuse; overhauled credential management with refcounted credentials and SASL service name; strengthened UNIX domain socket handling; fixed wakeup loop issues to boost event loop robustness; overall impact includes improved reliability, security, and developer clarity across the codebase.
May 2026
April 2026
31 Commits • 11 Features
Apr 1, 2026April 2026 monthly summary for curl/curl development. Focused on reliability, performance, and security improvements across asynchronous DNS resolution, HTTP/3 handshake flows, and connection setup. Substantial enhancements to test infrastructure and CI reliability, with concrete deliveries that reduce connection latency, improve robustness in edge-network scenarios, and enable better observability.
April 2026
31 Commits • 11 Features
Apr 1, 2026April 2026 monthly summary for curl/curl development. Focused on reliability, performance, and security improvements across asynchronous DNS resolution, HTTP/3 handshake flows, and connection setup. Substantial enhancements to test infrastructure and CI reliability, with concrete deliveries that reduce connection latency, improve robustness in edge-network scenarios, and enable better observability.
March 2026
35 Commits • 20 Features
Mar 1, 2026Month: 2026-03 summary focusing on delivering reliability, performance, and maintainability across curl's networking stack. Key features delivered include improved blocking DNS timeout calculation in async-ares, modularized DNS cache with enhanced negative-cache handling, and a foundational thread pool/queue infrastructure. Major improvements in concurrency handling (multi wakeup/wait refactor), security posture in TLS-related areas, and notable performance gains in core text processing. Numerous bug fixes stabilized data paths (MQTT EOF, SMB path memory mgmt, and more) and tightened error propagation and timestamp handling, reducing production incidents. This work positions curl for more scalable concurrent operations, predictable DNS resolution, and stronger security across platforms.
35 Commits • 20 Features
Mar 1, 2026Month: 2026-03 summary focusing on delivering reliability, performance, and maintainability across curl's networking stack. Key features delivered include improved blocking DNS timeout calculation in async-ares, modularized DNS cache with enhanced negative-cache handling, and a foundational thread pool/queue infrastructure. Major improvements in concurrency handling (multi wakeup/wait refactor), security posture in TLS-related areas, and notable performance gains in core text processing. Numerous bug fixes stabilized data paths (MQTT EOF, SMB path memory mgmt, and more) and tightened error propagation and timestamp handling, reducing production incidents. This work positions curl for more scalable concurrent operations, predictable DNS resolution, and stronger security across platforms.
March 2026
February 2026
4 Commits • 2 Features
Feb 1, 2026February 2026: Focused on stability, error clarity, and security in curl/curl. Delivered: (1) Request lifecycle stability: unconditional timer update when removing an easy handle from a multi, preventing delays due to 0-timer states. (2) Request state reset: ensured pausing/ratelimiting state resets with request resets. (3) Error reporting improvements: reset error buffer after a successful connection and added test to validate behavior. (4) Security/OpenSSL: added mechanism to retrieve the digest algorithm for certificate signatures used in channel binding without relying on NID. This combination reduces flaky behavior, improves troubleshooting, and strengthens security across multi-address resolution flows.
February 2026
4 Commits • 2 Features
Feb 1, 2026February 2026: Focused on stability, error clarity, and security in curl/curl. Delivered: (1) Request lifecycle stability: unconditional timer update when removing an easy handle from a multi, preventing delays due to 0-timer states. (2) Request state reset: ensured pausing/ratelimiting state resets with request resets. (3) Error reporting improvements: reset error buffer after a successful connection and added test to validate behavior. (4) Security/OpenSSL: added mechanism to retrieve the digest algorithm for certificate signatures used in channel binding without relying on NID. This combination reduces flaky behavior, improves troubleshooting, and strengthens security across multi-address resolution flows.
January 2026
21 Commits • 8 Features
Jan 1, 2026January 2026 focused on delivering tangible performance, reliability, and diagnostics improvements for curl/curl, with emphasis on NGTCP2/HTTP/3 workflows, stability and CI reliability, and robust TLS/resource handling. Key features were delivered to boost throughput and robustness in high-latency environments, improve diagnostic clarity, and optimize transfer handling, while test stabilization reduced flakiness and enabled faster issue resolution.
21 Commits • 8 Features
Jan 1, 2026January 2026 focused on delivering tangible performance, reliability, and diagnostics improvements for curl/curl, with emphasis on NGTCP2/HTTP/3 workflows, stability and CI reliability, and robust TLS/resource handling. Key features were delivered to boost throughput and robustness in high-latency environments, improve diagnostic clarity, and optimize transfer handling, while test stabilization reduced flakiness and enabled faster issue resolution.
January 2026
December 2025
28 Commits • 8 Features
Dec 1, 2025December 2025 highlights key feature deliveries, reliability improvements, and security posture enhancements across the curl/curl project. Notable work includes: thread-safe memdebug with enhanced logging; performance improvements via Quiche client writer to reduce buffering; stabilization of the test suite to reduce flaky tests and improve observability; security hardening with GnuTLS default PROFILE_MEDIUM; and improved protocol responsiveness with non-blocking EPRT FTP connections. These changes deliver higher stability, better performance under load, more deterministic debugging, and stronger default security across deployments.
December 2025
28 Commits • 8 Features
Dec 1, 2025December 2025 highlights key feature deliveries, reliability improvements, and security posture enhancements across the curl/curl project. Notable work includes: thread-safe memdebug with enhanced logging; performance improvements via Quiche client writer to reduce buffering; stabilization of the test suite to reduce flaky tests and improve observability; security hardening with GnuTLS default PROFILE_MEDIUM; and improved protocol responsiveness with non-blocking EPRT FTP connections. These changes deliver higher stability, better performance under load, more deterministic debugging, and stronger default security across deployments.
November 2025
51 Commits • 18 Features
Nov 1, 20252025-11 monthly summary for curl/curl highlighting performance, reliability, and portability improvements. Focused on delivering key features enabling better throughput and resilience, improved test stability, and strengthening cross‑platform TLS/cipher handling.
51 Commits • 18 Features
Nov 1, 20252025-11 monthly summary for curl/curl highlighting performance, reliability, and portability improvements. Focused on delivering key features enabling better throughput and resilience, improved test stability, and strengthening cross‑platform TLS/cipher handling.
November 2025
October 2025
46 Commits • 10 Features
Oct 1, 2025October 2025 (2025-10) monthly summary for curl/curl: Focused on stabilizing QUIC/TLS, enhancing IO paths, and expanding platform-friendly features. Delivered core fixes across QUIC/TLS core stability and resource management; improved VQuIC IO performance and reliability; added SSL connection reuse to boost throughput for repeated connections; strengthened HTTP/2 handling with validated push headers and cleanup on failure; and extended DOH policy alignment by inheriting new custom SSL flags. Collectively, these efforts improved reliability on high-latency networks, reduced teardown leaks, and lowered latency for secure connections, supporting broader adoption and maintainability.
October 2025
46 Commits • 10 Features
Oct 1, 2025October 2025 (2025-10) monthly summary for curl/curl: Focused on stabilizing QUIC/TLS, enhancing IO paths, and expanding platform-friendly features. Delivered core fixes across QUIC/TLS core stability and resource management; improved VQuIC IO performance and reliability; added SSL connection reuse to boost throughput for repeated connections; strengthened HTTP/2 handling with validated push headers and cleanup on failure; and extended DOH policy alignment by inheriting new custom SSL flags. Collectively, these efforts improved reliability on high-latency networks, reduced teardown leaks, and lowered latency for secure connections, supporting broader adoption and maintainability.
September 2025
34 Commits • 5 Features
Sep 1, 2025September 2025 performance summary for curl/curl. The team delivered core feature enhancements to multi-interface workflows, strengthened websocket reliability, and improved TLS/QUIC stability across multiple backends, while advancing safety, testing, and backend readiness. The work reduced latency and failure modes in high-load networking scenarios and broadened platform compatibility, reinforcing curl's role in production-grade deployments.
34 Commits • 5 Features
Sep 1, 2025September 2025 performance summary for curl/curl. The team delivered core feature enhancements to multi-interface workflows, strengthened websocket reliability, and improved TLS/QUIC stability across multiple backends, while advancing safety, testing, and backend readiness. The work reduced latency and failure modes in high-load networking scenarios and broadened platform compatibility, reinforcing curl's role in production-grade deployments.
September 2025
August 2025
30 Commits • 7 Features
Aug 1, 2025August 2025 (curl/curl) - Delivered significant networking core modernization, TLS/HTTP improvements, DNS resolver enhancements, and comprehensive build/test fixes. The work emphasizes business value through faster, more reliable connections, better observability, and improved memory usage, enabling safer deployments and easier maintenance.
August 2025
30 Commits • 7 Features
Aug 1, 2025August 2025 (curl/curl) - Delivered significant networking core modernization, TLS/HTTP improvements, DNS resolver enhancements, and comprehensive build/test fixes. The work emphasizes business value through faster, more reliable connections, better observability, and improved memory usage, enabling safer deployments and easier maintenance.
July 2025
35 Commits • 13 Features
Jul 1, 2025July 2025 performance and stability milestone for curl/curl: delivered targeted features, addressed core stability issues, and strengthened protocol support across QUIC/HTTP3, TLS, and networking stacks. Key enhancements include diagnostic visibility through Scorecard flame graphs and docs, a new long option for curl (--out-null), QUIC TLS pointer reporting (CURLINFO_TLS_SSL_PTR), updated WebSocket read callback support with an enhanced example, and HTTP/3 handshake reporting aligned with TCP behavior. Multiple quality and reliability fixes improved correctness, robustness, and test coverage, underpinning safer, faster, and more predictable network transfers.
35 Commits • 13 Features
Jul 1, 2025July 2025 performance and stability milestone for curl/curl: delivered targeted features, addressed core stability issues, and strengthened protocol support across QUIC/HTTP3, TLS, and networking stacks. Key enhancements include diagnostic visibility through Scorecard flame graphs and docs, a new long option for curl (--out-null), QUIC TLS pointer reporting (CURLINFO_TLS_SSL_PTR), updated WebSocket read callback support with an enhanced example, and HTTP/3 handshake reporting aligned with TCP behavior. Multiple quality and reliability fixes improved correctness, robustness, and test coverage, underpinning safer, faster, and more predictable network transfers.
July 2025
June 2025
35 Commits • 6 Features
Jun 1, 2025June 2025 (curl/curl) — Focused on stabilizing TLS/network paths, delivering API cleanups, and hardening CI across OpenSSL variants. The month combined critical bug fixes with strategic refactors that lay groundwork for backend-agnostic TLS, improved transfer management, and more robust test infrastructure.
June 2025
35 Commits • 6 Features
Jun 1, 2025June 2025 (curl/curl) — Focused on stabilizing TLS/network paths, delivering API cleanups, and hardening CI across OpenSSL variants. The month combined critical bug fixes with strategic refactors that lay groundwork for backend-agnostic TLS, improved transfer management, and more robust test infrastructure.
May 2025
30 Commits • 10 Features
May 1, 2025May 2025 monthly summary for curl/curl focused on delivering architectural improvements, reliability, and testability that enable faster, safer releases and stronger surface for TLS and multi-protocol usage.
30 Commits • 10 Features
May 1, 2025May 2025 monthly summary for curl/curl focused on delivering architectural improvements, reliability, and testability that enable faster, safer releases and stronger surface for TLS and multi-protocol usage.
May 2025
April 2025
34 Commits • 11 Features
Apr 1, 2025April 2025 (curl/curl) monthly performance summary: Delivered key features across asynchronous resolver enhancements, QUIC/OpenSSL integration, and comprehensive connection meta data handling, while stabilizing core transports and improving resource management. Targeted bug fixes across HTTP/2, TLS/QUIC, and testing infrastructure reduced edge-case failures and improved reliability. The outcomes contributed to stronger network performance, better cross-protocol state management, and maintainability improvements, aligning with business goals for robust, scalable connectivity.
April 2025
34 Commits • 11 Features
Apr 1, 2025April 2025 (curl/curl) monthly performance summary: Delivered key features across asynchronous resolver enhancements, QUIC/OpenSSL integration, and comprehensive connection meta data handling, while stabilizing core transports and improving resource management. Targeted bug fixes across HTTP/2, TLS/QUIC, and testing infrastructure reduced edge-case failures and improved reliability. The outcomes contributed to stronger network performance, better cross-protocol state management, and maintainability improvements, aligning with business goals for robust, scalable connectivity.
March 2025
29 Commits • 11 Features
Mar 1, 2025March 2025 monthly summary for curl/curl: Delivered stability, security, and performance improvements across HTTP/2, QUIC, and TLS backends, with substantial memory safety and test-quality gains. Highlights include resets and error detection in HTTP/2, streamlined transfer state via mid identifiers, and safer resource management across SSH stacks, alongside backend-specific correctness fixes and expanded test/build hygiene.
29 Commits • 11 Features
Mar 1, 2025March 2025 monthly summary for curl/curl: Delivered stability, security, and performance improvements across HTTP/2, QUIC, and TLS backends, with substantial memory safety and test-quality gains. Highlights include resets and error detection in HTTP/2, streamlined transfer state via mid identifiers, and safer resource management across SSH stacks, alongside backend-specific correctness fixes and expanded test/build hygiene.
March 2025
February 2025
24 Commits • 12 Features
Feb 1, 2025February 2025 performance summary for curl/curl: Delivered security and performance enhancements across TLS, QUIC, and session management, while stabilizing upgrades and improving maintainability. Implemented WolfSSL TLS early data support and centralized early data logic in vtls, enabling faster resume and reduced handshake latency. Brought TLSv1.3 early data support to the OpenSSL/quictls backend, expanding modern TLS deployment options. Extended SSL session cache with an exportable flag to improve cache portability and debugging. Completed a major multi-interface refactor to an event-based model, improving responsiveness and scalability across transports. These changes, combined with targeted bug fixes for TLS upgrades across POP3/IMAP/SMTP and HTTP/3 quic interactions, significantly enhance reliability and performance, delivering tangible business value through faster secure connections and more predictable behavior.
February 2025
24 Commits • 12 Features
Feb 1, 2025February 2025 performance summary for curl/curl: Delivered security and performance enhancements across TLS, QUIC, and session management, while stabilizing upgrades and improving maintainability. Implemented WolfSSL TLS early data support and centralized early data logic in vtls, enabling faster resume and reduced handshake latency. Brought TLSv1.3 early data support to the OpenSSL/quictls backend, expanding modern TLS deployment options. Extended SSL session cache with an exportable flag to improve cache portability and debugging. Completed a major multi-interface refactor to an event-based model, improving responsiveness and scalability across transports. These changes, combined with targeted bug fixes for TLS upgrades across POP3/IMAP/SMTP and HTTP/3 quic interactions, significantly enhance reliability and performance, delivering tangible business value through faster secure connections and more predictable behavior.
January 2025
22 Commits • 5 Features
Jan 1, 2025January 2025: TLS/SSL feature enhancements, HTTP/2 compliance fixes, protocol handling improvements, reliability fixes, and CI/test improvements. Delivered TLS session import/export support, early data handling, and updated session cache dimensions; fixed HTTP/2 TE header handling and data_pending checks; clarified protocol semantics and moved redirect handling to the protocol layer; stabilized WebSocket message sending and cleaned up connection filters; improved CI/test pipelines with colored pytest output, direct httpd/apache2 testing, and removal of the repeat parameter.
22 Commits • 5 Features
Jan 1, 2025January 2025: TLS/SSL feature enhancements, HTTP/2 compliance fixes, protocol handling improvements, reliability fixes, and CI/test improvements. Delivered TLS session import/export support, early data handling, and updated session cache dimensions; fixed HTTP/2 TE header handling and data_pending checks; clarified protocol semantics and moved redirect handling to the protocol layer; stabilized WebSocket message sending and cleaned up connection filters; improved CI/test pipelines with colored pytest output, direct httpd/apache2 testing, and removal of the repeat parameter.
January 2025
December 2024
7 Commits • 4 Features
Dec 1, 2024December 2024: Delivered key features, reliability improvements, and build hygiene for curl/curl, driving latency reduction, security, and multi-process reliability. Highlights include 0-RTT data support for QUIC over GnuTLS enabling faster HTTP/3 handshakes; a redesigned TLS session ticket caching mechanism with per-TLS-version structure and a put/take/return access pattern; connection limit aware shutdown handling to improve retries for pending transfers; and macOS build hygiene to reduce noisy warnings. Core bug fixes addressed data integrity and transfer reliability: fix for small-read stalls in the Base64 MIME encoder and MBedTLS send retry on blocked writes. The combined work enhances performance, security posture, and reliability across platforms.
December 2024
7 Commits • 4 Features
Dec 1, 2024December 2024: Delivered key features, reliability improvements, and build hygiene for curl/curl, driving latency reduction, security, and multi-process reliability. Highlights include 0-RTT data support for QUIC over GnuTLS enabling faster HTTP/3 handshakes; a redesigned TLS session ticket caching mechanism with per-TLS-version structure and a put/take/return access pattern; connection limit aware shutdown handling to improve retries for pending transfers; and macOS build hygiene to reduce noisy warnings. Core bug fixes addressed data integrity and transfer reliability: fix for small-read stalls in the Base64 MIME encoder and MBedTLS send retry on blocked writes. The combined work enhances performance, security posture, and reliability across platforms.
November 2024
6 Commits • 4 Features
Nov 1, 2024November 2024 highlights for curl/curl: delivered cross-TLS compatibility features, reinforced crypto initialization reliability, expanded observability and metrics, and strengthened testing. Focused on business value: smoother mixed TLS deployments, more robust security initialization, clearer transfer visibility, and improved error messaging across TLS stacks.
6 Commits • 4 Features
Nov 1, 2024November 2024 highlights for curl/curl: delivered cross-TLS compatibility features, reinforced crypto initialization reliability, expanded observability and metrics, and strengthened testing. Focused on business value: smoother mixed TLS deployments, more robust security initialization, clearer transfer visibility, and improved error messaging across TLS stacks.
November 2024
October 2024
10 Commits • 3 Features
Oct 1, 2024Monthly summary for curl/curl - 2024-10. Key accomplishments include delivering cross-backend TLS session caching and robustness improvements across wolfSSL, BearSSL, mbedTLS, and Schannel with QUIC session caching, plus a Schannel close-handling fix; expanding the testing framework to cover multi-backend SSL and CI improvements; and optimizing VQUIC performance with larger buffers and streamlined packet reception. Major bug fixes across the TLS/QUIC stack include Schannel recv handling fix for close-notify and an ngtcp2 recv loop fix, along with reliability improvements for multissl test runs. These changes enhance interoperability, reliability, and performance of TLS/QUIC paths, enabling faster secure deployments and reduced operational risk.
October 2024
10 Commits • 3 Features
Oct 1, 2024Monthly summary for curl/curl - 2024-10. Key accomplishments include delivering cross-backend TLS session caching and robustness improvements across wolfSSL, BearSSL, mbedTLS, and Schannel with QUIC session caching, plus a Schannel close-handling fix; expanding the testing framework to cover multi-backend SSL and CI improvements; and optimizing VQUIC performance with larger buffers and streamlined packet reception. Major bug fixes across the TLS/QUIC stack include Schannel recv handling fix for close-notify and an ngtcp2 recv loop fix, along with reliability improvements for multissl test runs. These changes enhance interoperability, reliability, and performance of TLS/QUIC paths, enabling faster secure deployments and reduced operational risk.
September 2024
19 Commits • 4 Features
Sep 1, 2024September 2024 monthly summary for curl/curl focusing on business value and technical achievements. Highlights include FTP robustness and timeout stabilization; HTTP/3 connection reuse and Alt-Svc enhancements; expanded testing framework, CI reliability, and test infrastructure; secure connectivity and IDN/SSH compatibility improvements; and SSH EAGAIN handling bug fix. Key outcomes: improved FTP transfer resilience and error reporting, consistent FTP command timeouts in tests, cross-version connection reuse with flexible defaults, refined Alt-Svc mappings, broader server and protocol test coverage (HTTP/2/HTTP/3) with robust tracing, IPv4 testing, and stronger secure connection handling via proper stunnel IP usage and IDN encoding. Business impact: higher reliability, reduced downtime for transfers, faster incident resolution, and a stronger security posture across transports and protocols. Commit references are listed per feature/bug to illustrate scope and traceability: FTP robustness and timeout stabilization (a7ccd026...; b2331f3e...; ef400f4f...; 98c7d4b1...), HTTP/3 connection reuse and Alt-Svc enhancements (433d7303...; 47d6ec98...), Testing framework/CI/test infrastructure enhancements (8ad3597d...; 94139493...; b20ac93f...; 7f3d5982...; cbbf4d8e...; b2dc9554...; 17a7e12e...; e61c5eb4...; 841fbdb6...; 6f2a1666...), Secure connectivity and IDN/SSH compatibility (f5189827...; 21fb30b5...), SSH EAGAIN handling bug fix (5895b71b...).
19 Commits • 4 Features
Sep 1, 2024September 2024 monthly summary for curl/curl focusing on business value and technical achievements. Highlights include FTP robustness and timeout stabilization; HTTP/3 connection reuse and Alt-Svc enhancements; expanded testing framework, CI reliability, and test infrastructure; secure connectivity and IDN/SSH compatibility improvements; and SSH EAGAIN handling bug fix. Key outcomes: improved FTP transfer resilience and error reporting, consistent FTP command timeouts in tests, cross-version connection reuse with flexible defaults, refined Alt-Svc mappings, broader server and protocol test coverage (HTTP/2/HTTP/3) with robust tracing, IPv4 testing, and stronger secure connection handling via proper stunnel IP usage and IDN encoding. Business impact: higher reliability, reduced downtime for transfers, faster incident resolution, and a stronger security posture across transports and protocols. Commit references are listed per feature/bug to illustrate scope and traceability: FTP robustness and timeout stabilization (a7ccd026...; b2331f3e...; ef400f4f...; 98c7d4b1...), HTTP/3 connection reuse and Alt-Svc enhancements (433d7303...; 47d6ec98...), Testing framework/CI/test infrastructure enhancements (8ad3597d...; 94139493...; b20ac93f...; 7f3d5982...; cbbf4d8e...; b2dc9554...; 17a7e12e...; e61c5eb4...; 841fbdb6...; 6f2a1666...), Secure connectivity and IDN/SSH compatibility (f5189827...; 21fb30b5...), SSH EAGAIN handling bug fix (5895b71b...).
September 2024
Activity
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Quality Metrics
Correctness92.8%
Maintainability85.4%
Architecture86.6%
Performance85.8%
AI Usage26.2%
Skills & Technologies
Programming Languages
CCMakeM4MakefileMarkdownNonePerlPythonShellXML
Technical Skills
ALPNAPI DevelopmentAPI designAPI developmentAPI testingAPI usageAsynchronous programmingAuthentication ProtocolsBug FixingBug fixingBuild SystemBuild System ConfigurationBuild configurationCC Programming
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline