GMDX seeks to enhance the player experience wherever possible, from gameplay to audio design to graphics, while maintaining strict respect for the original game’s identity and essential design principles. The objective is not to change the fundamental core of Deus Ex, but rather to dig deeper; to more fully achieve and build upon the creative vision put forth by Warren Spector and the Ion Storm Austin team back in 2000.
http://www.moddb.com/mods/gmdx
http://genericname112.wixsite.com/gmdx
This modification is way better than Revision, Shifter and BioMod. Also providing a lot of interesting gameplay mechanics for enemies and their AI on top of player buffs.
Shame about textures but all other mods are bad at that too.