Classic boxing ring view in Punch-out Doom mod for Doom II 1994

TurokDooM: Legacy of the Fireseeds is a total conversion of Doom II based on the TurokDooM mod created by Murden64 in 2008-09. The current version represents a massive overhaul, including content from Turok 1, Turok 2, Turok 3, Rage Wars, and Evolution.

Trench Foot is a total conversion for DOOM in a dieselpunk style, inspired by Warhammer 40K. You play as a fanatical and merciless Templar Knight, destined to march through infected, radioactive trenches and wage an apocalyptic holy war against heretics, cultists, and demonic monsters.

Brutal Doom 64 is a mod for Doom that enhances the dark atmosphere of the original through new lighting, sound, animations, and reworked enemies. It makes the game more violent and intense while preserving the overall tone of Doom 64 and adding elements from Brutal Doom.

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

C&C: Brute Force is a mod for Yuri's Revenge that turns the game into a kind of Tower Defense: you start with minimal forces, defend against endless waves of Yuri's minions, find random supplies, and gradually strengthen your base to eventually reach the dictator himself.