Best API Gateways & Backends GitHub Repositories

Project templates for Revit add-ins

Opentonapi simplifies development of TON-based applications and provides an API centered around high-level concepts like Jettons, NFTs and so on keeping a way to access low-level details.

A modern, lightweight, and customizable C# Discord library with Native AOT support, immutable caching, voice capabilities, and complete API coverage.

Template to build modern web apps with a classic REST API. Ideal if you need offline & real-time features on day one.

Open weather data for humans.

Fast, simple, and dependency-free physics engine written in C# with a clear and user-friendly API.

🗜 A Ruby wrapper for the bit.ly API

Starknet full node designed for peak concurrency and efficiency

⚔️ Community maintained directory, MCP and API of 3,000+ active bug bounty programs and VDPs

Open Source Metering and Usage Based Billing

YouTrackDB is a general-use object-oriented graph database with storage format native to handle graph relations. YouTrackDB supports Gremlin queries and ACID transactions. YTDB supports both embedded and client-server deployment models.

Chrome Extension, download photos, videos from Instagram post, tv, reels, stories and highlights

A paper library for creating custom inventory-based GUIs.

Zero-shot text classification over plain HTTP — no API key, no account. One Cloudflare Worker, a CLI, and an MCP server. https://classifier.dev

📘 Get all Warframe items directly from Warframe's API. No more messy wikia scraping.

Local-first API workflows that go from HAR file to GitHub Actions in 60 seconds.

AI API gateway that ends manual channel switching with smart routing, auto failover, exponential cooldown, multi-URL scheduling, live request monitoring and soft-error detection.

Generate Refit interfaces and contracts from OpenAPI (Swagger) specifications

Run a 105 GB AI model on a Mac that can't hold it. Slotstream streams Qwen3.8-Flash-Next (125B mixture of experts) from your SSD and caches the busiest experts in memory, so it runs on Macs with 16 to 64 GB. One native Swift binary on MLX and Metal, no Python, offline. Works with Claude Code, Codex and Ollama or OpenAI clients.

Java test automation framework for web, mobile, API, CLI, database, and desktop E2E testing with a fluent API and built-in reporting.