Backend GitHub Repositories (2026) · Open Source Tools

The open-source cloud for agents & devs. Including Auth, Databases, Storage, Functions, Messaging, Hosting, Realtime, WAF and more

Instant SECURE Full Stack Apps and AI Agents

Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.

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.

A complete Sigma detection engineering toolkit: parser, linter, formatter, evaluator, correlation engine, conversion framework, streaming daemon, MCP and LSP servers :crab:

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

An open-source activism platform

Apache Lucene open-source search software

Instant REST and MCP APIs for PostgreSQL and MySQL, on existing or new databases. CRUD, custom SQL routes, auth and ACL without writing a backend. Low-code, ⚡ realtime, high-performance. Native MySQL support since v2.5

Self-Hosted API Management for Builders

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

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

Kora is simple, easy, performant Java & Kotlin comprehensive framework for backend applications

Parse Server for Node.js / Express

The infrastructure platform for the intelligence era

EasyAdmin is a fast, beautiful and modern admin generator for Symfony applications.

Build custom admin panels. Fast!

Example project showing how to build a Spring Boot App providing a GUI with Vue.js

SonicJS - The edge-native headless CMS for Cloudflare Workers. Sub-100ms response times, zero cold starts, TypeScript-first. Built on D1, R2, and Hono.

Apache Solr open-source search software