Hexen: Edge of Chaos for Doom 3 - Part 1
Recommended Files

Duke Nukem 3D - Legacy EditionDuke Nukem 3D (1996)
Duke Nukem 3D - Legacy Edition is a total overhaul of Duke Nukem 3D, turning the game into a more challenging and dynamic shooter. New weapons, enemies, alternate fire modes, a score system, and reworked balance demand tactics, speed, and precision. This is a hardcore reimagining focused on survival and mastery.

Corrosive EternityQuake (1996)
Corrosive Eternity is a Quake mod in the form of a massive metal map with a hellish industrial atmosphere and around a thousand enemies. Tense, well-crafted combat and an abundance of power-ups keep the experience dynamic despite the difficulty.

Half-Life Blue Shift: MModHalf-Life (1998)
Half-Life: Blue Shift: MMod is an add-on that allows you to play the Blue Shift campaign with the enhancements and mechanics of Half-Life: MMod.

Abysm 2: Infernal Contract + ExpansionsDoom II: Hell on Earth (1994)
Abysm 2: Infernal Contract is an adventure total conversion of Doom 2 on the GZDoom engine with RPG elements, in the spirit of Diablo, Dark Souls, and Strife. A hub world with quests, dungeons, and secrets awaits you, along with an inventory and leveling system, choice of starting class, magic, medieval weapons, and diverse enemies.

Might & Magic: Heroes 5.5Heroes of Might and Magic V (2006)
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.

TurokDooM: Legacy of the FireseedsDoom II: Hell on Earth (1994)
TurokDooM: Legacy of the Fireseeds is a total conversion of Doom II based on the TurokDooM mod created by Murden64 in 2008-09. The current version represents a massive overhaul, including content from Turok 1, Turok 2, Turok 3, Rage Wars, and Evolution.

DOOM 4 VANILLADoom II: Hell on Earth (1994)
Doom 4 Vanilla is a gameplay mod for Doom II whose goal is to show what Doom (2016) could have been like if it had been released in 1993. It overhauls weapons, enemies, graphics, and sound, using DeHackEd tricks to convey the dynamics and aggression of modern Doom within the limitations of the original Doom II engine.