DBeaver - DBeaver - Universal Database Manager and SQL Client.
iotlist - Discover the internet of things
SQuirreL SQL - SQuirreL SQL is an open-source Java SQL Client program for any JDBC compliant database
Fieldbook - Create a database, as easily as a spreadsheet
DBComparer - Free Compare database tool - DBComparer 3.0 is a professional compare database tool for comparing Microsoft SQL Server 2008 (and 2005) database structure.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.