QueryPie vs AQT

The default color is dark and comfortable for the eyes.

The multi-tab and multi-SQL-runs are great. It's always good to be able to compare results in one window instead of having to go through and re-run stuff.

They only support 2 at the moment (MySQL and MariaDB) but their social site says they'll be updating with more DBMSes in the near future which is pretty nice because I hate learning new GUIs~

Not sure about Linux but it works on Windows and Mac just fine!

A visual data explorer to view your SQL result set and easily total, sort, format, and group it (grouping is done by dragging columns to the header and groups can easily be collapsed/expanded and show column subtotals). You can also freeze columns on the left to for easy viewing of wide result sets, copy any row or rows to excel or other tool including column headings and get totals by highlighting adjacent columns.

A point-and-click data loader that generates your create table statement when creating a new table and includes the ability to add column expressions to alter/clean your source data during the load.

A robust visual query builder that has the ability to easily create SQL including complex sub-queries, supports with clauses and can save your table relationships for re-use.