http://www.moddb.com/mods/gmdx

Dubbed the "Definitive Deus Ex Experience" web-wide, GMDX is a one-of-a-kind all-encompassing modification of the classic video […]
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Dubbed the "Definitive Deus Ex Experience" web-wide, GMDX is a one-of-a-kind all-encompassing modification of the classic video game Deus Ex, currently half a decade into rigorous development. Intended to be the best looking and playing version of Deus Ex available all the while remaining true to the original identity of the game, GMDX is the greatest thinking man's Shooter/Sneaker/RPG hybrid on another level. Prepare to be blown away by Deus Ex once more.
www.gmdxmod.com
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Polished, Tight, Deep Gameplay
{
1: Vastly Overhauled, Formidable Artificial Intelligence;
2: Polished, highly refined weaponry;
3: Deeper, more balanced RPG systems;
4: New player tools and mechanics, such as mantling, zooming in with scopes, and upgraded augmentations;
5: New physics, User Interface upgrades, difficulty and config options and more;
6: Deeper simulation aspects -- attention to detail second to none.
7: Every aspect of Deus Ex's fantastic gameplay refined in ways you'd never have thought possible;
}

Enhanced Artistic Direction (and graphics)
{
1: Faithfully enhanced level design and level detail;
2: New high resolution textures;
3: many new graphical effects and art asset replacements;
}

Extensive Bugfixing
{
1: the most comprehensive bugfixing mod available;
2: there's no erroneous functionality too small for GMDX;
}

Audio Design Updates
{
1: new sounds to replace duplicates, replace low quality audio, or enhance actions that were previously silent (e.g climbing ladders);
2: updated audio experienced in the world, increasing immersion;
}

//This and so much more!