Beekeeper Studio is a free and open source SQL editor and database manager. Beekeeper Studio is cross-platform, and available for Linux, Mac, and Windows.
Autocomplete SQL query editor with syntax highlighting
Tabbed interface, so you can multitask
Sort and filter table data to find just what you need
Save queries for later
Query run-history, so you can find that one query you got working 3 days ago
Default dark theme