- Home: http://www.xforce-online.de/, https://sourceforge.net/projects/xforceffd/
- Inspiration: X-COM: Apocalypse, X-COM: Terror from the Deep, X-COM: UFO Defense
- State: beta, inactive since 2011
- Download: https://sourceforge.net/projects/xforceffd/files
- Keyword: strategy, clone, turn-based
- Code repository: https://gitlab.com/osgames/xforceffd.git (backup of svn, @created 2018, @stars 1, @forks 0), https://svn.code.sf.net/p/xforceffd/code (svn)
- Code language: Pascal
- Code license: GPL-2.0
- Developer: Christian Reich, Dirk_F, gnfalex, Martin Kanich, Natter, Sebastian Gingter