Classic space combat in Tyrian 2000 OpenTyrian2000 engine mod

Aleph One Marathon Trilogy is an open-source engine built from the Marathon 2: Durandal source code released by Bungie. It allows you to run and modernize the classic Marathon trilogy (Marathon, Marathon 2, Infinity) on modern PCs, with graphics improvements, online multiplayer, and mod support.

Project Survival is a heavily reworked version of the Project Brutality mod for Doom, focused on survival and horror, featuring new and redesigned weapons, new animations, enemies, improved AI, and strict resource management.

DOOB is a deliberately "terrible" mod for DOOM — and that's exactly what makes it wonderful. The game's graphics use intentional primitivism that transforms the gritty shooter into an absurd comedy.

Fallout: Bakersfield is a total conversion of Fallout on the GZDoom engine that reimagines the original game as a first-person RPG shooter while preserving the classic atmosphere and familiar locations. The game is set in Necropolis, the post-war ruins of Bakersfield, California.

FreemanAPI - an easy-to-use API for implementing movement mechanics from the original Half-Life and Half-Life 2 in other games.