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

Insomnia is an open-source, cross-platform API client that supports GraphQL, REST, WebSockets, SSE, and gRPC protocols. It provides comprehensive API debugging, design, testing, and collaboration capabilities with flexible storage options including local, cloud, and Git-based solutions.
Insomnia is designed for API developers, backend engineers, and DevOps teams who need a powerful, open-source alternative to proprietary API clients. It's ideal for teams requiring flexible storage options, comprehensive protocol support, and collaboration features without sacrificing security or data privacy.

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)

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

Free and open-source API Client & Interceptor.

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

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

JavaScript API for Chrome and Firefox

JavaScript API for Chrome and Firefox

The world’s fastest framework for building websites.

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