Top BACKEND GitHub Repositories & Tools (2026)

Appwrite® - complete cloud infrastructure for your web, mobile and AI apps. Including Auth, Databases, Storage, Functions, Messaging, Hosting, Realtime and more

Open Source realtime backend in 1 file

Build, run and scale AI agents like API and microservices

Run any process, on your machine or in an AI agent's environment, as if it were a pod in your Kubernetes cluster: real env vars, DNS, network, traffic.

Apache Lucene open-source search software

Self-Hosted API Management for Builders

Open-source Back-end, self-hostable & ready to use - Real-time, storage, advanced search - Web, Apps, Mobile, IoT -

Sentry SDK for Ruby

Batteries-included backend that works with any stack.

Backend.AI is a streamlined, container-based computing cluster platform that hosts popular computing/ML frameworks and diverse programming languages, with pluggable heterogeneous accelerator support including CUDA GPU, ROCm GPU, Gaudi NPU, Google TPU, GraphCore IPU and other NPUs.

Fastify 5 application boilerplate based on clean architecture, domain-driven design, CQRS, functional programming, vertical slice architecture for building production-grade applications 🚀

💎 Ruby on Rails agent for Forest Admin to integrate directly to your existing Ruby on Rails backend application.

Servercn , the backend component registry for Node.js inspired by shadcn/ui. The shadcn philosophy for Node.js backend.

Instant SECURE Full Stack Apps and AI Agents

Modular framework for creating selective indexers and featureful backends for dapps

The Buildsmith framework. Fast, async, and built with everything you need to ship.

The backend agents build with - Multimodal database, orchestration, and serving in one file

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

Open-source Telegram server implementation / MTProto server in Go for Telegram Desktop, Android, Web, bots, calls, media, and self-hosted chat experiments.

the browser-facing portion of osu!