How to make sprays
Track Server with GameTracker
17 Buddies.net, a popular site for downloading dod maps & files. 2,713 dod maps available.
(A link for listing dod maps is found on the left column of the page)
Gamebanana - Game & file site. Link is to their dod section, with 518 maps, plus skins, sounds, etc :
Jed's Half-Life Model Viewer v1.35 download (Wonderboy.org) - A great program for viewing/altering game models
Guide to DOD Server Commands