Original website: http://coucoutte.free.fr/soft.html
wmAppKill is a Window Maker dock app that lists all your running processes. You can kill any of them by double-clicking on their names.
For comments, see the original dockapps.org entry.
A newer version may be available in the Window Maker dockapps git repository:
git clone https://repo.or.cz/dockapps.git