| Mutator | Author | Info | |
|---|---|---|---|
| -=Unlimited Translocations=- | Unknown | 1 mutator , 1 weapon | |
| UltraInstagib | HO0815XX | 1 mutator , 1 weapon | |
| UNK Akimbo RC2 | Unknown | 1 mutator , 10 weapons | |
| Unreal[x]Weapons | Unknown | 4 mutators , 5 weapons | |
| Unreal[x]Weapons2014 | TKBS | 18 mutators , 21 weapons | |
| Unreasonable Tournament | Unknown | 1 mutator , 10 weapons | |
| UT2007 Color | Unknown | 1 mutator | |
| UT3 BestOfUnreal Part1 Beta | Unknown | 4 mutators , 3 weapons | |
| UT3 D9 Arc Generator Final | Rumple | 1 weapon | |
| UT3 D9 Assault Rifle Final | Rumple | 1 weapon | |
| Ut3 Quakes Big Fing Gun | Unknown | 1 weapon | |
| UT3 RickRoller | Unknown | 1 weapon | |
| UT3Fixer P3.1 | Nico de Vries | 3 mutators | |
| UTCompIII v1 | Unknown | 1 mutator | |
| UTCompIIIv4 Beta2 | Bobb "Default" Bittner | 2 mutators | |
| UTFusrodahReplacer | Unknown | 1 mutator , 1 weapon | |
| UTMutator_AtomRipper | PyroPhreak | 1 mutator , 1 weapon | |
| UTMutator_Coda | Unknown | 1 mutator , 1 weapon | |
| UTMutator_SpeedMod | Unknown | 1 mutator | |
| UTNyanReplacer | Unknown | 1 mutator , 1 weapon |