DBeaver - DBeaver - Universal Database Manager and SQL Client.
Microsoft SQL Server Compact - Bring Microsoft SQL Server 2017 to the platform of your choice. Use SQL Server 2017 on Windows, Linux, and Docker containers.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
UnQLite - UnQLite is a in-process software library which implements a self-contained, serverless...
DbGate - Open Source Database Manager for SQL Server, MySQL, PostgreSQL, SQLite, MongoDB, Redis and more
VoltDB - In-memory relational DBMS capable of supporting millions of database operations per second