Doom II mod Babel intense combat inside vine-covered stone corridors

BlooM is a massive crossover of Doom and Blood for GZDoom, combining the maps, enemies, and weapons of both games into a single universe. The mod features one episode consisting of 8 large levels, dozens of hybrid monsters, an atmospheric soundtrack, and the ability to play as either Doomguy or Caleb.

Realism Invictus is a large-scale mod for Civilization IV: Beyond the Sword that reworks the game toward historical authenticity and depth. Hundreds of technologies, leaders, and units, unique civilizations, epidemics, revolutions, and a complex economy take the game to a new level.

Resident Evil: Cold Blood is a Half-Life mod based on the Resident Evil Outbreak universe that immerses you in the atmosphere of survival during a zombie apocalypse. You'll need to wisely use limited ammunition, mix powders, manage inventory, and think through every move.

Hollywood Holocaust Rethinked — a next-gen reimagining of Duke Nukem 3D's first level using Polymer: updated 3D models, lighting, cutscenes, and new small areas while preserving the original layout.

Alice Dreamland is a major story mod for American McGee's Alice with many new levels - from a bright candy kingdom to gloomy catacombs. It adds new enemies, the Cashier Frog character, bonuses, difficulty, voice acting, easter eggs and references.