KeeperFX Unofficial is the continuation of the now abandoned KeeperFX Project.
Download the latest full release here. Or read more here.
The most recent development has periodic alpha releases, shared and detailed here.
This program, including the wiki and associated issue list, is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.