Paid vs. Free subcategories
mkdocstrings/griffe 💎 hidden gem
Compares two versions of a Python package and lists the changes that would break code calling it.
Kong/insomnia
A desktop application for sending requests to an interface and reading what comes back.
python-attrs/cattrs 💎 hidden gem
Turns loose data into declared Python objects, and declared objects back into loose data.
GoogleChrome/lighthouse-ci
Runs the standard page audit on every code change and fails the change if the page got slower.
unocss/unocss
A styling engine that reads the labels in your markup and generates only the CSS those labels need.
HypothesisWorks/hypothesis
A Python library that generates test inputs and reduces any failure to the smallest example that still fails.
vitest-dev/vitest
A test runner for JavaScript and TypeScript that reuses a project's existing Vite build settings.
oxc-project/oxc
Fast replacements for the usual JavaScript checker, formatter, parser and minifier, usable one piece at a time.
Neoteroi/BlackSheep 💎 hidden gem
A fast Python web framework with request validation, authentication and API documentation included.
rest-sh/restish 💎 hidden gem
A command-line tool for calling web APIs, with short commands and saved logins.
msgspec/msgspec
It reads JSON and similar formats into Python objects and checks their shape in the same pass.
schemathesis/schemathesis
It reads a web service's own description and attacks it with thousands of generated requests.
pocketbase/pocketbase
One downloaded program that provides a database, user accounts, file storage and an admin screen.
testcontainers/testcontainers-python 💎 hidden gem
Tests get a real, empty PostgreSQL, started and destroyed automatically.
ascorbic/unpic-img 💎 hidden gem
One image component for Astro, React and eight other frameworks that already knows imgproxy's URL format.
mermaid-js/mermaid
A library that renders flowcharts, sequence diagrams, timelines and mind maps from short blocks of plain text.
adobe/react-spectrum
A collection of libraries and tools that help you build adaptive, accessible, and robust user experiences.
americanexpress/jest-image-snapshot
✨ Jest matcher for image comparisons. Most commonly used for visual regression testing.
apache/jmeter
Apache JMeter open-source load testing tool for analyzing and measuring the performance of a variety of services
appsmithorg/appsmith
Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.
argos-ci/argos
The open source visual testing platform for teams and AI agents. Review the product, not just the code.
artilleryio/artillery
The complete load testing platform. Everything you need for production-grade load tests. Serverless & distributed. Load test with Playwright. Load test HTTP APIs, GraphQL, WebSocket, and more. Use any Node.js module.
bugzilla/bugzilla
Official repository for the Bugzilla bug tracking system. Report bugs to https://bugzilla.mozilla.org/enter_bug.cgi?product=Bugzilla&format=__default__ . Main website:
calibreapp/image-actions
A Github Action that automatically compresses JPEGs, PNGs, WebPs & AVIFs in Pull Requests.
CodeGraphContext/CodeGraphContext
An MCP server plus a CLI tool that indexes local code into a graph database to provide context to AI assistants.
colbymchenry/codegraph
Pre-indexed code knowledge graph, auto syncs on code changes, for Claude Code, Codex, Gemini, Cursor, OpenCode, AntiGravity, Kiro, CoPilot, and Hermes Agent — fewer tokens, fewer tool calls, 100% local
concourse/concourse
Concourse is a container-based automation system written in Go. It's mostly used for CI/CD.
cortex-docs/cortex
Cortex - Generates interactive API documentation, typed SDKs, and MCP servers from OpenAPI, AsyncAPI, GraphQL, gRPC, OpenRPC, and Markdown.
croffasia/itsaplan
⭐️⭐️⭐️ Open-source, self-hosted alternative to Linear and Plane. Project management and issue tracking where teams and AI agents work side by side to plan and ship products.
DeusData/codebase-memory-mcp
Local code intelligence for developers and AI agents. Connect code, docs and infrastructure in a persistent graph, with CBM Lens, MCP tools, agent integrations and change-aware test selection.
dotnet/aspnetcore
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
fallow-rs/fallow
Codebase intelligence for TypeScript and JavaScript. Health, complexity hotspots, duplication, architecture boundaries, circular dependencies, design-system drift, and unused code, from one graph. CLI, GitHub Action, LSP, MCP, and VS Code. Rust, MIT licensed.
fastapi/fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production
flyimg/flyimg
Dockerized application that resizes and crops images on the fly, delivering optimized images in formats such as AVIF, WebP, MozJPEG, or PNG using ImageMagick, with an efficient caching system.
fortio/fortio
Fortio load testing library, command line tool, advanced echo server and web UI in go (golang). Allows to specify a set query-per-second load and record latency histograms and other useful stats.
foss42/apidash
API Dash is a beautiful AI-powered open-source cross-platform (Desktop & Mobile) API Client built using Flutter which can help you easily create & customize your HTTP & GraphQL API requests, visually inspect responses and generate API integration code. A lightweight alternative to postman/insomnia.
Gimanh/taskview-community
TaskView is a self-hosted project and task management platform focused on clarity, ownership, and control. TaskView is built for teams that want a transparent, self-hosted alternative to SaaS task managers.
hcengineering/platform
Huly — All-in-One Project Management Platform (alternative to Linear, Jira, Slack, Notion, Motion)
hey-api/hey-api
👨🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode, PayPal, AWS, Autodesk, and many more.
hook0/hook0
Open-source webhook server that helps you provide webhooks to your users. It handles for you a great amount of features that are usually tedious to (re)implement.
hoppscotch/hoppscotch
Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia
joda32/yowie
Finds the SaaS services an organisation subscribes to, using only externally observable data. Built for shadow IT discovery.
jonrau1/ElectricEye
ElectricEye is a multi-cloud, multi-SaaS Python CLI tool for Asset Management, Security Posture Management & Attack Surface Monitoring supporting 100s of services and evaluations to harden your CSP & SaaS environments with controls mapped to over 20 industry, regulatory, and best practice controls frameworks
kubb-labs/kubb
🧡 Turn your API spec into type-safe code. Generate TypeScript types, API clients, hooks, validators and mocks from a spec such as OpenAPI.
kucherenko/jscpd
Copy/paste detector for source code. 220+ languages, Rust engine, SARIF/HTML/badge reporters, GitHub Action, MCP server for AI agents.
Leantime/leantime
Leantime is a goals focused project management system for non-project managers. Building with ADHD, Autism, and dyslexia in mind.
lovell/sharp
High performance Node.js image processing, the fastest module to resize JPEG, PNG, WebP, AVIF and TIFF images. Uses the libvips library.
mattermost-community/focalboard
Focalboard is an open source, self-hosted alternative to Trello, Notion, and Asana.
mountain-loop/yaak
The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Server Sent Events, and gRPC 🦬
mui/material-ui
Material UI: Comprehensive React component library that implements Google's Material Design. Free forever.
ncarlier/webhookd
A minimalist, powerful webhook server designed to easily trigger shell scripts and run external processes via HTTP requests.
nightwatchjs/nightwatch
Integrated end-to-end testing framework written in Node.js and using W3C Webdriver API. Developed at @browserstack
nocobase/nocobase
NocoBase is an open-source AI + no-code platform for building business systems fast. Instead of generating everything from scratch, AI works on top of production-proven infrastructure and a WYSIWYG no-code interface, so you get both speed and reliability.
OpenAPITools/openapi-generator
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
opf/openproject
OpenProject is the leading open source project management software for product, project and portfolio management. A powerful Jira alternative with agile planning, issue tracking, roadmaps, Gantt charts, time tracking, collaboration features, and more. Available on premises or in the cloud. ⭐ Star us on GitHub
oraios/serena
A powerful MCP toolkit for coding, providing semantic retrieval and editing capabilities - the IDE for your agent
orval-labs/orval
orval is able to generate client with appropriate type-signatures (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification, either in yaml or json formats. 🍺
oxsecurity/megalinter
🦙 MegaLinter analyzes 50 languages, 22 formats, 21 tooling formats, excessive copy-pastes, spelling mistakes and security issues in your repository sources with a GitHub Action, other CI tools or locally.
plankanban/planka
Elegant open source project tracking. Self-hosted Kanban for teams — free Community edition, with PLANKA Pro for organisations.
pytest-dev/pytest
The pytest framework makes it easy to write small tests, yet scales to support complex functional testing
RARgames/4gaBoards
Straightforward realtime kanban boards management for intuitive task tracking. 4ga Boards features an elegant dark mode, collapsible todo lists, and multitasking tools to supercharge your team's productivity.
redmine/redmine
Mirror of redmine code source - Official Subversion repository is at https://svn.redmine.org/redmine - contact: @vividtone or maeda (at) farend (dot) jp
refinedev/refine
A React Framework for building internal tools, admin panels, dashboards & B2B apps with unmatched flexibility.
repowise-dev/repowise
Codebase intelligence for AI and humans: code health scores, auto-generated docs, git analytics, dead code detection, and architectural decisions via MCP.
spotbugs/spotbugs
SpotBugs is FindBugs' successor. A tool for static analysis to look for bugs in Java code.
spring-projects/spring-boot
Spring Boot helps you to create Spring-powered, production-grade applications and services with absolute minimum fuss.
swagger-api/swagger-codegen
swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.
terryyin/lizard
A simple code complexity analyser without caring about the C/C++ header files or Java imports, supports most of the popular languages.
testcontainers/testcontainers-java
Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.
tirth8205/code-review-graph
Local-first code intelligence graph for MCP and CLI. Builds a persistent map of your codebase so AI coding tools read only what matters, with benchmarked context reductions on reviews and large-repo workflows.
ToolJet/ToolJet
Open-source foundation of ToolJet AI - the enterprise app generation platform for internal tools, dashboards, business applications, workflows and AI agents. Build visually, from a prompt, or from Claude Code, Codex and Cursor over MCP 🚀
twbs/bootstrap
The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.
uikit/uikit
A lightweight and modular front-end framework for developing fast and powerful web interfaces
usekaneo/kaneo
🎯 All you need. Nothing you don't. Open source project management that works for you, not against you.
Visual-Regression-Tracker/Visual-Regression-Tracker
Backend and Frontend application for tracking differences via image comparison
vitali87/code-graph-rag
The ultimate RAG for your monorepo. Query, understand, and edit multi-language codebases with the power of AI and knowledge graphs
VoidenHQ/voiden
Design, Test and Document APIs in plain Markdown. Compose Requests with API blocks. Reuse, Replace & Version everything just like code. Offline, Truly Git Native, No Lock-in.
webhooksite/webhook.site
⚓️ Easily test HTTP webhooks with this handy tool that displays requests instantly.
webp-sh/webp_server_go
Go version of WebP Server. A tool that will serve your JPG/PNG/BMP/SVGs as WebP/AVIF format with compression, on-the-fly.
wekan/wekan
FLOSS kanban, built with Meteor. Official Public Support at GitHub issues only. Official Private Pre-Paid Support at https://wekan.fi/commercial-support/ only. Translation PRs to imports/i18n/data/en.i18n.json, other translations at https://app.transifex.com/wekan/wekan . No telemetry.
writer/aperio
Open-source SSPM for SIEM-native teams: detect SaaS posture risks, inventory OAuth shadow IT, and stream normalized findings to your security stack.
zilliztech/claude-context
Code search MCP for Claude Code. Make entire codebase the context for any coding agent.
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