Best Open Source Relational Databases (SQL) using Java in 2026

Neon Postgres

Serverless Postgres for modern applications

Stars
22,392
Forks
1,007
Last commit
1 month ago

Cloud-native, auto-scaling Postgres with instant branching, bottomless storage, and pay-per-use pricing

Open Source Alternative to:

Supabase

Turso

SQLite-compatible database for scalable multi-tenant applications

Stars
16,910
Forks
503
Last commit
27 days ago

Turso provides a simple developer experience with SQLite compatibility, allowing you to build and scale multi-tenant applications with unlimited databases.

Open Source Alternative to:

Supabase

CrateDB

Scalable SQL database for real-time analytics

Stars
4,414
Forks
601
Last commit
10 hours ago

Distributed SQL database designed for high-speed ingestion and complex queries on massive datasets, ideal for IoT and time-series data.

Open Source Alternative to:

Snowflake

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Neon Postgres

Serverless Postgres for modern applications

Stars
22,392
Forks
1,007
Last commit
1 month ago

Cloud-native, auto-scaling Postgres with instant branching, bottomless storage, and pay-per-use pricing

Open Source Alternative to:

Supabase

Turso

SQLite-compatible database for scalable multi-tenant applications

Stars
16,910
Forks
503
Last commit
27 days ago

Turso provides a simple developer experience with SQLite compatibility, allowing you to build and scale multi-tenant applications with unlimited databases.

Open Source Alternative to:

Supabase

CrateDB

Scalable SQL database for real-time analytics

Stars
4,414
Forks
601
Last commit
10 hours ago

Distributed SQL database designed for high-speed ingestion and complex queries on massive datasets, ideal for IoT and time-series data.

Open Source Alternative to:

Snowflake

Open Source Relational Databases (SQL) using Java

A curated collection of the best open source database systems based on the relational model (SQL). using Java.

Neon Postgres

Turso

CrateDB

Neon Postgres

Turso

CrateDB