Rest API GitHub Repositories (2026) · Open Source Tools

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

Open source GPS tracking platform - self-hosted or managed, 200+ device protocols

🚀 A real-time monitoring dashboard for Claude Code & Codex, built with SQLite3, Node.js, Express, React, Vite, TailwindCSS, & WebSockets. It tracks sessions, agent activity, tool usage, and subagent orchestration, providing live analytics, a Kanban status board, status notifications, a cute buddy, & an interactive web UI/MacOS/Windows native app.

Send push notifications to your phone or desktop using PUT/POST

Free open-source desktop app that scrapes JAV metadata and generates NFO + cover art for Jellyfin, Emby & Kodi. No Docker, no CLI — one-click install on Windows & macOS. 8 built-in sources + optional Metatube federation (30+ providers), actress collections, cross-language tag aliases, and a REST API for AI agents.

GOWA - WhatsApp REST API with support for UI, Multi Account, Webhooks, and MCP, and Chatwoot. Built with Golang for efficient memory use.

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

Instant SECURE Full Stack Apps and AI Agents

Patch bundle registry for ReVanced, Morphe, and Reseam, with searchable patches, app compatibility, historical releases, prereleases, and changelogs retrievable through a REST and GraphQL API plus a user friendly frontend.

Modern REST framework for Django with types and async support!

Simple, Fast, Code first and Compile time generated OpenAPI documentation for Rust

:date: Easy!Appointments - Self Hosted Appointment Scheduler

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

OpenAPI Diff and Breaking Changes

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

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

⚡️ Express inspired web framework written in Go

Apache Camel is an open source integration framework with 350+ connectors. Write routes in Java, YAML, or XML. Run on Spring Boot, Quarkus, or standalone. Apache License 2.0.

The SMS Gateway for Android™ Server enables the dispatch of SMS messages through Android devices without requiring direct Internet access to them.

WhatsApp REST API gateway in Rust. Multi-device and the official WhatsApp Cloud API behind one API: 230+ endpoints for messaging, templates, Flows, commerce, payments, calls, groups, webhooks and fleet ops. Multi-session, multi-DB, single binary.