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StumpWM

StumpWM is a tiling window manager that was created when developer Shawn Betts found ratpoison growing increasingly large and " lispy". Intended as a successor to ratpoison, StumpWM is released under the terms of the GNU General Public License, version 2 (GPLv2).

As explained on the StumpWM wiki, the developers decided to largely re-implement ratpoison in Common Lisp using CLX:

The authors describe StumpWM in the following terms: