Open Source Developer Tools Projects

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

A community-driven self-hosted Git forge, forked from Gitea, focused on software freedom and federation.

Painless self-hosted all-in-one software development service with Git hosting, code review, CI/CD, and package registry.

🚀 HTTPie Desktop — cross-platform API testing client for humans. Painlessly test REST, GraphQL, and HTTP APIs.

Open source API development ecosystem - https://hoppscotch.io (open-source alternative to Postman, Insomnia)

Run and test HTTP requests with plain text — a simple yet powerful command-line tool for API testing.

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

A headless browser built from scratch in Zig, optimised for AI agents and automation with 9x less memory and 11x faster execution than Chrome.

Open-source no-code platform for web scraping, crawling, search and AI data extraction.

An open-source terminal-native AI coding agent with cross-session memory, multiple agents, and support for any LLM provider.

Open platform for governing execution authority at decision surfaces across agents, AI systems, and enterprise workflows.

Open-source AI IDE that plans before it codes, using spec-driven development with requirements, design, and task steps.

Battle-tested AI code review agent with deterministic pipelines + LLM, fine-tuned security rules, and line-level comments.

OpenCode is an open source agent that helps you write code in your terminal, IDE, or desktop.

Open-source AI agent toolkit with an interactive coding agent CLI, unified multi-provider LLM API, and TUI libraries.

Open-source project management platform — an alternative to Jira, Linear, Monday, and ClickUp.

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern Rest API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

Open-source platform for building and deploying reliable background jobs, scheduled tasks, and AI workflows in TypeScript.

Design, test and document APIs in plain Markdown with a git-native, offline-first approach.

An agentic development environment built on a modern Rust terminal emulator with AI-powered coding features.

Local-first desktop project manager for small dev teams with Kanban workflow and zero cloud dependency.

The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Server Sent Events, and gRPC 🦬