Database
Relational, document, vector and in-memory databases.
Appwrite
BSD-3-ClauseOpen-source backend platform providing authentication, databases, storage, functions and realtime APIs, self-hosted or as a managed cloud service.
Actively maintained
- Backend
- Database
- Authentication & Security
Cassandra
Apache-2.0Distributed wide-column NoSQL database designed for massive scale and zero single point of failure across multiple data centers.
Actively maintained
- Database
FoundationDB
Apache-2.0Distributed, ordered key-value store with strong ACID transaction guarantees, designed as a reliable storage substrate for other systems.
Actively maintained
- Database
Hasura
Apache-2.0Instant GraphQL and REST APIs on top of PostgreSQL and other databases, via Data Connectors.
Actively maintained
- Backend
- API
- Database
Milvus
Apache-2.0Open source vector database built for scalable similarity search and AI applications.
Actively maintained
- AI & Machine Learning
- Database
MongoDB
SSPL-1.0Document-oriented NoSQL database designed for scalability and developer flexibility.
Actively maintained
- Database
Neo4j
GPL-3.0Native graph database that stores and queries data as nodes and relationships, purpose-built for connected data problems.
Actively maintained
- Database
PocketBase
MITOpen source backend consisting of an embedded SQLite database, authentication, file storage and a realtime API in a single executable.
Actively maintained
- Backend
- Database
PostgreSQL
PostgreSQL LicensePowerful, open source object-relational database system with over 35 years of active development.
Actively maintained
- Database
Qdrant
Apache-2.0Vector database and similarity search engine for building AI applications with embeddings.
Actively maintained
- AI & Machine Learning
- Database
Redis
AGPL-3.0In-memory data structure store used as a database, cache, message broker and streaming engine.
Actively maintained
- Database
- Storage
Supabase
Apache-2.0Open source Firebase alternative providing a Postgres database, authentication, instant APIs, edge functions, realtime subscriptions and storage.
Actively maintained
- Backend
- Database
- Authentication & Security
TiDB
Apache-2.0MySQL-compatible distributed SQL database that scales horizontally while supporting both transactional and analytical workloads.
Actively maintained
- Database
Valkey
BSD-3-ClauseIn-memory data store and community-led fork of Redis, created after Redis's 2024 license change moved it away from an open-source license.
Actively maintained
- Database