Oldunreal.com, the only and number one Unreal community site and forum that I visit. :)
Industrial Unreal - Ikuto's Unreal forum! =D
Zora's World, a useful site with good maps and mods to download.
Hyper.nl, very good site with much stuff on it. You must visit this! =D
Themasternl.nl - many mods (especially guns).
PCube's site - you should visit this. Lots of stuff! Also dead now, thanks to spammer noobs. Fuck you noobs!
PCube's new site
Bio-Hazard's site - There are lots of additional guns and monsters available for download. Too bad. This was a nice site. Go there and see what happened. :( Poor Bio, we'll always remember you.
Skw's Website [Currently under construction...]
Chaos Revolution website - Ikuto's website about Unreal and his clans. Many downloads!
Unreal Stalker Server - Latest news, updates, downloads, and information on..uuhmmm..anything!
Lander's 0101 Realm - He's an artist and a musician, also my good friend. Click on the link now! =]

IRC links: