- Old School Players [OsP] - Includes news, forum, and player information.
osp.clanpages.com
- Opium Clan [OPIUM] - Member roster, clan history, match and server information, downloads, and screenshots.
home.jam.rr.com/halflifetfc
- Order of the Blue Flame - News, member roster, game guides, match information, chat, and forum.
www.clan-obf.co.uk
- Organized Chaos - News, match information, and member roster.
OrganizedChaosHome.tripod.com
- Otis Team Fortress - Clan membership information.
members.tripod.com/~clifffa/otistfc.html
- Out For Revenge [OFR] - News, downloads, member roster and match history.
clanofr.8m.com
- The Omnipotent [OMNI] - News, member roster, clan and match information, and forum. Member of OGL.
omni.clanhappy.com
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