Awesome
dmenu - dynamic menu
dmenu is an efficient dynamic menu for X.
Requirements
In order to build dmenu you need the Xlib header files.
Installation
Edit config.mk to match your local setup (dmenu is installed into the /usr/local namespace by default).
Afterwards enter the following command to build and install dmenu (if necessary as root):
make clean install
Running dmenu
See the man page for details.