
:books: A collection of useful resources for building RESTful HTTP+JSON APIs.

A comprehensive, curated collection of tools and resources for designing, building, testing, and managing RESTful HTTP+JSON APIs. This reference guide cuts through the overwhelming ecosystem of API development options, organizing thousands of resources across 17+ categories to help developers make informed decisions about which tools suit their needs.
Backend developers, API architects, and DevOps engineers building HTTP+JSON APIs who need a centralized reference for discovering and comparing development tools. It's ideal for teams evaluating technology stacks or developers new to API development looking to understand the full tooling landscape.

Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

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

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

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

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

A list of Free Software network services and web applications which can be hosted on your own servers

Fair-code workflow automation platform with native AI capabilities. Combine visual building with custom code, self-host or cloud, 400+ integrations.

Get up and running with Kimi-K2.5, GLM-5, MiniMax, DeepSeek, gpt-oss, Qwen, Gemma and other models.

Production-ready platform for agentic workflow development.

Production-ready platform for agentic workflow development.

User-friendly AI Interface (Supports Ollama, OpenAI API, ...)

Virtual whiteboard for sketching hand-drawn like diagrams

High performance self-hosted photo and video management solution.

The Postgres development platform. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications.

JavaScript API for Chrome and Firefox