xex is a small and simple program launcher for X, written in Perl-Gtk2.
If you find yourself frequently loading up an xterm just to run one X command, you may find this useful. Unlike all the other similar programs I could find, it aims to have the minimum necessary feature set (ie, a history list), and occupy the minimum amount of screen estate possible (while still being readable).
Version 1.3 is the first public release, under the GNU GPL. Download xex 1.3.