qzdoom (software-rendered engine for Doom and related games) QZDoom is a continuation of dpJudas's truecolor software rendering, for ZDoom, merged with and forked from GZDoom. It supports Doom, Doom II, Heretic, Hexen, Strife, and most other IWAD games. See README_SBo.txt for optional runtime dependencies. Starting with qzdoom-2.1.0 BUILD=2, it's now safe to install gzdoom and qzdoom on the same Slackware system.