Leagues

Case's Ladder - Parent site for multiple competitions, includes links to leagues in specific games.
www.casesladder.com

ClanBase - Includes results and contact information for competing clans.
www.clanbase.com

Elite Clan Warfare - Playing spearhead, Call of Duty:United Offensive, and Counter-Strike:Source. Includes player/team statistics and downloads area.
www.eliteclanwarfare.com/

Multiplayer Games League - Playing Day of Defeat, Half life and Counter Strike series games. Includes past results and news.
www.mgleague.co.nz/

Online Gaming League - Includes forums, supported games list, and rules.
worldogl.com/

ProLeague - Counter-Strike series leagues organised by country. Prizes available.
www.proleague.org

QuakeCon - Annual event with multiple games. Forum and gallery of previous years.
www.quakecon.org/

Squad Games - Includes forums, downloads, results and fixtures.
www.squadgames.com/

Stronger than All - Includes results, fixtures, forums, and config files for download.
www.sta-league.org/

United Gaming Clans - Playing TFC and Counter-strike. Includes news, fixtures, results, forums, downloads and IRC chat.
www.ugcleague.com

WarLeagues - Includes gallery, downloads, forum and competitor information.
www.warleagues.com