Best open-source Backend & APIs projects

An open source Go backend shipped as a single executable, with embedded SQLite, realtime subscriptions, user and file management, and an admin UI.

Open-source, self-hostable backend platform for building apps, offering Auth, Databases, Storage, Functions, Messaging, Realtime, Hosting and MCP access for agents.

A Rust library for connecting apps by public key, with QUIC transport, hole-punching, and relay fallback so peers can connect regardless of IP address.

A Python framework for building web scrapers that aim to get past bot detection, with browser and HTTP request modes, UI generation, and desktop app support.

Open-source, headless multi-vendor marketplace platform built on Medusa, adding vendor onboarding, offers, commissions and payouts.