TNM is a huge singleplayer mod for Deus Ex based on the gaming community, finally released after 7 years of development.
Among the best mods I have ever played. It's on par with Deus Ex, if not better. It's not without it's problems, for example I found the weird inside jokes at the beginning portions of the story just out of place, and it initially made me think that the devs weren't really serious about the whole thing. But I'm glad I kept going and played it from start to finish, as it actually turned out to be one of the best mods I have ever laid my hands on. Superb atmosphere, very "Deus-Ex-y" feel about it. It's been a few years since I last played it, but just listening to the soundtrack on youtube gives me the nostalgic chills that very few games have been able to deliver in my lifetime. Along with Zodiac, a must play for all true DX fanatics!