Top REST GitHub Repositories & Tools (2026)

Open source, composable payments platform | PCI compliant | SaaS and Self-host options | Enables connectivity to multiple payment, payout, fraud, vault and tokenization providers | Uplifts authorization with intelligent routing and revenue recovery | Reduce payment processing costs with cost observability | Reduces payment ops with reconciliation

Turn any REST, SOAP, GraphQL or SQL API into MCP tools for Claude & ChatGPT. Self-hosted. 258 connectors: ERP, e-commerce, SAP.

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

FastAPI framework, high performance, easy to learn, fast to code, ready for production

Milvus is a high-performance, cloud-native vector database built for scalable vector ANN search

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

Free, open-source, offline-first Point of Sale for cafes, restaurants, and food businesses.

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

Low code web framework for real world applications, in Python and Javascript

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

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

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

Parse Server for Node.js / Express

An opinionated GoLang framework for accelerated microservice development. Built in support for databases and observability.

gRPC to JSON proxy generator following the gRPC HTTP spec

MCP Toolbox for Databases is an open source MCP server for databases.

The no-magic web API and microservices framework for Python developers, with a focus on reliability and performance at scale.

Headless open-source eCommerce platform on top of PHP/Symfony/API Platform

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

A tool for mocking HTTP services