Best API Gateways & Backends GitHub Repositories

A Ruby interface to the Twitter API.

An AI Gateway, registry, and proxy that sits in front of any MCP, A2A, or REST/gRPC APIs, exposing a unified endpoint with centralized discovery, guardrails and management. Optimizes Agent & Tool calling, and supports plugins.

Unified Realtime/API framework for .NET platform and Unity.

Static site generator for .NET API documentation.

Mechanize is a ruby library that makes automated web interaction easy.

📊 A minimalist, self-hosted WakaTime-compatible backend for coding statistics

The Ruby-native AI framework. Chats, agents, tools, images, audio, and video through one consistent API, in plain Ruby or Rails.

:date: Easy!Appointments - Self Hosted Appointment Scheduler

An open-source framework for Steam Client themes and plugins

A Kubernetes controller for Elastic Load Balancers

Home for Cluster API, a subproject of sig-cluster-lifecycle

command line management for Google Workspace

The most popular PHP library for use with the Twitter OAuth REST API.

Full featured CSV parser with simple api and tested against large datasets.

The open source error catcher that's Airbrake API compliant :ukraine:

Open-source AI sales OS — self-hosted CRM with native AI agents + WhatsApp (WAHA). Open alternative to Kommo, Octadesk & Intercom for any business that sells by chat. MCP-ready, multi-tenant, LGPD.

XChange is a Java library providing a streamlined API for interacting with 60+ Bitcoin and Altcoin exchanges providing a consistent interface for trading and accessing market data.

A next-gen FOSS self-hosted unified zero trust secure access platform that can operate as a remote access VPN, a ZTNA platform, API/AI/MCP gateway, a PaaS, an ngrok-alternative and a homelab infrastructure.

oneAPI Deep Neural Network Library (oneDNN)

PHP library for the Stripe API.