Cozy dimly lit interior with fireplace in Doom 3 mod The Dark Mod

Sven Co-op is a cooperative mod for Half-Life where players team up to complete the campaign and custom maps together, featuring improved AI and new gameplay features.

Diablo 2 Randomizer is a small program for the original Diablo 2 that modifies various aspects of the game, making playthroughs "random" and unconventional compared to the vanilla version.

Doom Deluxe is a mod that gathers the best of Doom’s modding scene into a single project. Around 20 weapon types with high-quality alt-fires, an updated bestiary with new enemy abilities, and a reworked armor system and power-up spheres.

Chain Reaction is a mod for Half-Life that adds a new story campaign telling the story of a Black Mesa complex hydroelectric power plant employee working in sector G.

Freedoom is a completely free game on the Doom engine. It contains its own levels, textures, music and sounds and is compatible with most custom levels and mods, allowing you to play Doom without needing to own the original game.