Mods is a term applied to unofficial games modifications made by the general public. They can be entirely new games in themselves or add some new features. They generally include new items, weapons, characters, enemies, models, textures, levels, story and musics. They can be single-player or multiplayer.
- Biomod - a mod which alters the rules of the original game and add some new features.
- Shifter - a mod which alters the rules of the original game and add some new features.
- The Nameless Mod - a total conversion mod with new story.
- Redsun 2020 - a total conversion mod with new story.
- ZODIAC - a total conversion, as Paul Denton, the augmented brother of the infamous JC Denton.
- Deus Ex: Revision - An overhaul of environment, graphics, soundtrack and gaming experience.
- Give Me Deus Ex - A large-scale overhaul modification which features changes to AI, weaponry, RPG mechanics, environmental detail, audio, effects, and user interface.