Requested at grml survey:

Ratmen is a simple program for displaying a menu in a window. On selection is 
may either run a program or simply write something on standard out. It is 
inspired by, and is similar in function to, 9menu and ratmenu but is muchly 
improved. It includes: user settings in X resources, long and short option 
names (using getopts), scrollable menus (if they do not fit on screen), both 
mouse and keyboard support, exiting on unfocus and a decent manpage.

http://www.update.uu.se/~zrajm/programs/ratmen/?M=D