Best API Gateways & Backends GitHub Repositories

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)

Generate Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON/YAML/CSV.

PHP library for the Stripe API.

🐻 The multi-zone service mesh for containers, Kubernetes and VMs. Built with Envoy. CNCF Sandbox Project.

The missing integration layer for AI agents. Let them call any OpenAPI / MCP / GraphQL / custom js functions in secure environment.

The reactive client store for your API.

External-model router for Codex with guided Kimi OAuth/API, DeepSeek, safe migration, and rollback.

A proxy server for adding push to your API, used at the core of Fastly's Fanout service

OpenAPI based HTTP Client code generator

Input OpenAPI. Output SDKs and Docs.

PipesHub is an open-source platform for securely connecting enterprise knowledge to AI. Give AI agents trusted context and your team permission-aware search with verified citations across your business systems.

General data-binding package for Jackson: works on streaming API (core) implementation(s)

Open-source MCP server for LinkedIn. Give Claude and any MCP-compatible AI agent access to profiles, companies, jobs, and messages.

A fast, lightweight and more productive microservices framework

.NET Client for Telegram Bot API

Next generation noIM application in your own workspace, not only another Slack/Discord/Rocket.chat