Alien landscape with rocket launcher — Half-Life Blue Shift: MMod

The AMC Squad is a large-scale story-driven FPS built on the Build engine, blending retro shooter gameplay with modern mechanics. It features multiple episodes, dozens of levels and playable characters with unique weapons, a base with research and upgrade systems, and a wild mix of themes — from zombies and demons to outer space and time travel.

Retrozone is an atmospheric total conversion aiming to recreate the atmosphere and spirit of the legendary S.T.A.L.K.E.R. series on the Doom engine. The mod features recognizable Soviet architecture, textures and soundtrack from Shadow of Chernobyl, tense bandit ambushes, and a small but enjoyable arsenal.

BREACH is a Doom mod that turns the game into an ultra-realistic tactical shooter. Forget about demons: you're in for brutal close-quarters combat in confined spaces, realistic ballistics, breaching doors with C4, blinding flashbangs, night vision devices, and advanced enemy AI.

Half-Life Overhaul Reanimation Pack — an addon for the Half-Life Overhaul Pack mod, adds weapons and elements from Opposing Force, as well as new animations for classic guns.

Schism is a gameplay mod for Doom based on Brutal Doom, combining magic, melee combat, and firearms. The mod adds new classes, weapons, and enemies, overhauls the balance, and immerses classic Doom in bloody dark fantasy.