» FPS Banana: Team Fortress 2    Information and downloads for custom maps, skins, sprays and scripts.    http://www.fpsbanana.com/games/297

» TF2 Dev    Signature generator, map of the week, videos, and forums.    http://tf2dev.com/

» TF2 Sprays    Custom logos and sprays.    http://tf2sprays.com/

» TF2Maps.net    Forums, and downloads for maps, models, textures, and tutorials.    http://tf2maps.net/

» Toy Soldiers    Map pack and modification. Includes information, files, and forum.    http://toysoldiers.olddrunkenbastards.com/

» Valve Developer Community - Team Fortress 2    Official collaboratively edited site that provides tutorial for making maps and modifications.    http://developer.valvesoftware.com/wiki/Team_Fortress_2