As a long time fan of Quake, I have wanted to bring the game into a more modern engine. I have admired the DarkMod ever since they created it and am somewhat surprised that Quake has never had a project similar to that.
So, here is QUIP (Quake Update and Improvement Project).
I have ported many Quake things (textures, maps, sounds from Eargasm) over to idtech4 and used some stuff that is out there to bring it all together (Shambler's Castle for Doom 3, watermod for Doom 3). Idtech4 seems to be a fantastic engine that still holds up pretty well and the def and script files are very similar to quakec. Here's how it looks so far:
https://youtu.be/xoGtkeYCQR8
Sorry about the sound sync, I haven't played with demos that much.
I am going to continue to work on this if there are others that want to help or not. As of right now, I am stuck as a Doom 3 mod, as I only dabble (not very advanced) as an engine coder. For those that know the idtech4 forks, which would be a good one to proceed with? The biggest need would probably be models. There are only the Shambler's Castle monsters (shambler, vore, scrag, demon) to work with now. There are some models that are rigged for blender (soldier, player, dog, ogre) that could be converted to md5. I don't know about modeling and blender is not something I am going to spend months learning. I seem to be rambling now.
So, anyone interested in building a Quake community project?