Xash3D Engine

Edge of Darkness is a single-player mod for Half-Life where Gordon Freeman is sent by the A.C.I.B. organization to a secret mountain base to stop a new threat. The mod combines dynamic combat, atmospheric locations, and cinematic events.

Afraid of Monsters: Dark Assistance is a cooperative version of the cult horror mod for Half-Life. You play as drug addict David Leatherhoff, who battles hallucinations and monsters in his own distorted mind. The mod offers both cooperative and single-player gameplay, improved graphics, new weapons, and redesigned maps.

Half‑Life: Decay: Solo Mission is a Half‑Life mod that ports all chapters of the PS2‑exclusive expansion Half‑Life: Decay into a fully playable single‑player campaign while preserving the original gameplay.

Half-Life: Sudden Invasion is a remaster of the cult mod Half-Life: Invasion that improves graphics, interface, mechanics and reworks maps.

Half-Life: Echoes is a Half-Life modification that lets you experience the events of the original game from a different perspective while improving graphics and animations. You play as a scientist codenamed "Subject #12" who arrives at the Black Mesa Research Facility on the day of the disaster. Now his main goal is to survive amidst the chaos.