GMDX is an award-winning large-scale modification for the 2000 PC classic Deus Ex. GMDX addresses the many flaws of the game, polishes it to a very high standard, and adds new layers of depth that one would have hoped to see in a sequel. GMDX is executed with the strict parameter of staying true to the original design principles that define Deus Ex, and seeks to improve all aspects of design excluding the plot and soundtrack. The cumulative result thus far is said to be, and aims to be the "definitive Deus Ex experience".
I just started replaying this game on v6.3. The improvements on v6.2 were great but this takes it to a whole new level. This game remains faithful to the original while improving on it's gameplay and AI in many ways. It adds new weapons like the USP, which has differences from the Regular Pistol. It also improves the Skill system and overall Stealth. It gives a much needed gameplay overhaul to what is my favourite game of all time and I can't thank the developer of this mod more.