Short version:
Almost all the textures from Unreal Tournament (78MB)
http://www.zshare.net/download/148619483b1f909c/
Almost all the sounds from Unreal Tournament (45MB)
http://www.zshare.net/download/14916268e046e15b/
Some more sounds (15.6MB)
http://www.zshare.net/download/149290686b369e77/
Some textures from Red Faction 27MB
http://www.zshare.net/download/150056458b5266a3/
Sounds from Red Faction in 8 bit mono FLAC format 36MB
http://www.zshare.net/download/15012799b3751d4e/
And the sounds that I accidentally missed in the above zip 13.5MB
http://www.zshare.net/download/152504012ad59f23/
Textures from Kingpin 30MB
http://www.zshare.net/download/5079725646a511eb/
Requiem Avenging Angel sounds 30MB
http://www.zshare.net/download/506712939c5d4d45/
Chasm the Rift resources (textures (but not the flats) and sounds) 8MB
http://www.zshare.net/download/508094699608ede4/
I guess I could get the flats out, but most aren't that stunning and they take a little more time to extract. If there is a desperate need, I suppose I could do it.
Cyclones resources (textures, sounds music) 4MB
http://www.zshare.net/download/50809669f610eee8/
Tekwar graphics 12MB
http://www.zshare.net/download/508103105118bb7c/
[/edit]
I don't know about you, but I'm sick to the back teeth of seeing Quake/Quake2 (and even Quake3) textures in Doom mods. All those brown, heavy industrial textures that have been used in Doom so many times that they almost seem like part of the original texture set are just so dull and boring to my eyes these days.
So, I hope that some people may find a use for the textures linked to below. IMO, they are a much more attractive, far more varied and far more interesting set of textures than the Quake ones. They are most of the textures from Unreal Tournament. I know that anyone with UT can get these textures using the editing tools provided with the game but they don't seem to have been used very often.
A few things to be aware of:
The textures are in a zip and not in any way set up to be used in Zdoom. Many could just be dropped into a WAD/PK3 but some would need a bit of additional work (eg resizing or renaming to shorten their file name).
I have left them in their own palette in PNG format. Why? because that way they can be used in GZdoom in their original colours - many make nice use of subtle blues, greens and pinks. However, many also look very good in the Doom palette and people can either just use those ones in Zdoom and leave Zdoom itself to do the colour remapping or use a graphics program of their choice to do it (Zdoom usually does a very good job).
I have edited a handful of the textures to make them tile a bit better etc but this has been minimal.
Quite a lot of the textures are quite large - and look too big in Doom without scaling. I considered either resizing the textures in question to something more normal, or putting them into a WAD with a texture1 lump to scale them. However, I didn't. Why? Well, it wasn't laziness, honest

A lot of the skies are a bit disappointing. Quite a few don't tile properly from left to right. However, there is some reasonably interesting stuff in there, so I left them and people can tinker with them as they see fit. There are some nice sky ceiling textures that can be used to good effect in Zdoom-style skyboxes though.
There are some textures that I thought looked as though they should have transparent areas. I marked the appropriate areas with cyan (

Some textures are clearly set up to be animations. However, because I did not put the textures in a Zdoom usable package, I didn't see much point in making an animdefs for them. It's an easy task for a modder to do anyway.
I sorted the files into the following groups.
CTF - Just a bunch of textures with UR CTF logos on them.
Natural - mainly earth, natural rock, water etc
Sky - pretty obvious, stuff related to skies
Techy - modern, futuristic and alien looking textures
Traditional - Stone walls, wood, castle-like stuff.
This was done fairly quickly and there are some that could easily be in more than one category and there will also be some in the wrong place that I missed.
Anyway, have fun with them.
http://www.zshare.net/download/148619483b1f909c/
About 78 MB and, yes, it took over 90 minutes to upload on my slow connection so it better not be corrupt.

Oh, and if anyone wants the sounds, I guess I could do them too but it won't be today. Zipped, they come to about 44 MB and I can't be bothered sitting waiting for that to upload too.