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Identity Crisis
http://dynamic3.gamespy.com/~identitycrisis/index.shtml
Offers skins, models, tools, tutorials, FAQs, and a forum.
Moose Skins
http://www.mooseskins.com/
Skins, tutorials, and digital art.
Undulation
http://www.planetunreal.com/undulation/
Level editing textures.
Yahoo! Groups: utmodeling
http://games.groups.yahoo.com/group/utmodeling/
Mailing list archive and subscription information.