For those wondering: Seems to be coded in Java and supports a decent number of SQL databases:

PostgreSQL

Oracle

MySQL

MariaDB

Mirosoft SQL Server

IBM Db2

SQLite

Sybase

Amazon Redshift

Firebird

Informix Dynamic Server

H2

Exasol

My only "negative feedback" since I dont have time to test it out so far is the name of the tool. Jailer does not imply database management to me. When I think of jailer I think of containers, I guess databases can be seen as container types.

Personally I have a JetBrains license so I usually just opt to use DataGrip (Which I have some minor gripes against) most of the time. Although a lot of the time I use HeidiSQL for MySQL / MariaDB since I got too used to it.

I will have to see if I have time to try this tool next.