Free & Open-Source Microsoft SQL Server Alternatives

Enterprise relational database.

1. PostgreSQL ↗ ★ PICKFOSSPRIVATESELF-HOST
   World's most advanced open-source relational DB.
   ●●○Medium · Strong feature parity
2. MariaDB ↗ FOSSPRIVATESELF-HOST
   MySQL fork — fast, free, fully open.
   ●●○Medium · Strong feature parity
3. SQLite ↗ FOSSPRIVATE
   Embedded zero-config single-file database.
   ●●○Medium · Strong feature parity