Cross-Platform Level Editor for Doom3 and The Dark Mod
Superproject containing build scripts and tools to download assets
Source port of Doom, Heretic, Hexen and Strife developed in Delphi
Quake Engine Map Viewer
Qreate is a sandbox mod/extension for id software's Quake.
A Quake Live duel map veto system.
A simple map launcher for Quake.
Export Quake maps from Blender 2.73+
3D to GZDoom void map converter
Quake III Arena GPL Source Release