Heretic

GitHub - Blasphemer/blasphemer aims to create a free content package for the Heretic engine, with a theme of metal-inspired dark fantasy.

Hacked Heretic voortzetting van het werk van Hast
DelphiHeretic port naar Delphi programmeertaal.
HeXetic This is the first port of Heretic and Hexen to DJGPP and Allegro. The Doom Wiki - Hexetic.

glheretic (archive.org)

(gl)heretic port for FreeBSD:

• FRESHports heretic
• heretic Makefile

This provided the hint to compile glheretic on SuSE 8.x instead of 9.1 to make it work on SuSE 9.1:

This code is based on a recent patch to glheretic needed to make
heretic work correctly when compiled using gcc-3.3.*:

Source: SuSE-9.0 gcc-3.3.1 optimization turns off important warning

WADs In Progress bevat screenshots van WADs waar aan gewerkt word.
Heretic Treasure Chest is a 3-episode megawad released in March 2010, created by as an attempt at doing the Heretic equivalent of the Community Chest series. Download here.