MaxED

Heretic2R. Heretic II (1998, Raven Software) reverse-engineered source port.

GZDoom-Builder. Comprehensive map editor for Doom, Heretic, Hexen and Strife based games mainly geared towards GZDoom source port. Based on Doom Builder 2 by CodeImp (http://www.doombuilder.com/).

Simple-Quake-Launcher-2. A simple map/mod/demo launcher for Quake, Quake 2, Hexen 2 and Half-Life.

Duke-Builder. C#

Mission64-data. Game data for Mission 64 Quake 2 mod

KMQuake2. KMQuake II Engine by Knightmare http://www.markshan.com/knightmare/

Mission64-src. gamex86 source for Mission 64 Quake 2 mod

Re-Exhumed. Exhumed/Powerslave (PC, 1996) game recreation for GZDoom engine.

dwml_cs. OMML to LaTeX conversion library.

Quakespasm. Extra bloaty junk to modernise stuff a bit.

BDLite. BDLite, BDLite, it's like Brutal Doom but without so much shite