With many others, the CryEngine for Far Cry.

The Cube and Cube 2 / Sauerbraten engines

A specialized top down engine for strategy games (see GREED Game).

2 different hacks to the quake engine: Fisheye Quake and PanQuake

Random graphics experiments and very old engine prototypes.

The single and multiplayer FPS gameplay for Cube 1 & 2 games.

Game design & production for 3rd Space Incursion game.

various strategy designs for the GREED Game.

RPG design for EisenStern (canceled).

Some mobile games.

Unfinished game design experiments / prototypes

Random game design ideas / documents

Quake maps

Doom maps

Maps for Cube 1 & 2 such as aard3c.

The in-game editor for Cube 1 & 2

WadC editor: A programming language / procedural map editor for Doom 1 & 2