HHexen

Home: http://hhexen.sourceforge.net/hhexen.html, https://sourceforge.net/projects/hhexen/
Inspiration: Hammer of Thyrion
State: mature, inactive since 2013 (svn activity until 2019)
Download: http://hhexen.sourceforge.net/hhexen.html#s2, https://sourceforge.net/projects/hhexen/files/
Platform: Linux
Keyword: strategy, content commercial + original required, first-person, shooter
Code repository: https://svn.code.sf.net/p/hhexen/code (svn)
Code language: C
Code license: GPL-2.0
Code dependency: SDL

Hacked Hexen. Also includes HHeretic.

Building