Unreal 1998/RTNP/Gold, Deus Ex 2000?
First of all, I'm glad to see an UE1 reimplementation, because Epic wouldn't open source the code themselves as this isn't worth their effort. Damn you Epic. But for some reason they decided to license the source to OldUnreal under an NDA. What the heck is wrong with you, Epic!?
In addition to Tournament, also supporting the original 1998 Unreal SP game could bring many opportunities such as enhanced graphical fidelity (akin to Quake2XP), custom game DLLs and even a possible virtual reality port (DrBeef, I'm looking at you).
There is also this project based off version 200, but I have no idea if it ever held up or if it even works.
Having another retro shooter be open sourced would be super amazing, considering we had id Softwares' code for ages, and now Croteam connected as well with their open source release of Serious Engine.
p.s. I have to add that I'm not a low-level developer nor a graphics developer, and I have no reverse engineering expertise. As much as I would want to get the project kicked off asap, I lack the knowledge necessary.