Appwrite

Open-source backend platform: auth, databases, functions and storage.

Appwrite is an open-source backend-as-a-service platform providing authentication, databases, file storage, serverless functions, messaging, and realtime APIs through SDKs for many languages and frameworks. It is delivered as a self-hostable Docker-based stack and also offers a managed cloud. It is notable for its broad cross-platform SDK coverage spanning web, mobile, and server runtimes.