Intense combat in Doom4 Death Foretold mod for Doom II Hell on Earth

Half-Life: Crossfire — a story-driven mod for Half-Life that lets you experience the Black Mesa incident through the eyes of security guard Jordan Foster. Fight for survival during the Xen invasion, find Dr. Cross, and protect her at all costs.

HL4K: RT Reloaded is a 4K texture pack for the XashRT engine (Xash3D branch with tracing support) that replaces the original Half-Life textures with highly detailed 4K versions and adds real-time ray tracing: dynamic lighting, reflections and shadows, while preserving the atmosphere and gameplay of the classic game.

This is possibly the best major mod for Heroes of Might & Magic V, which greatly expands the original game. It adds new objects, larger battlefields, new heroes, classes, skills, artifacts and spells, an improved map generator, smarter AI, and reworked balance, significantly increasing variety.

In Mute Witness Stand is a mod for Half-Life set during World War I. You play as British soldiers fighting in the trenches against the German army and an army of the dead, raised by experimental chemical weapons.

Perfected Doom 3 is a mod for Doom 3 that transforms the classic shooter into a modern horror action game. The mod completely overhauls weapon balance, adds new monsters from Quake and earlier Doom entries, improves graphics, and introduces iron sights mechanics.