League

OFFL (Online Fantasy Football League) is a web application for hosting American-rules fantasy football leagues.

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Developer: Stephen Rochelle and Brad Schwie
License: GNU General Public License (GPL)
Operating System: Platform Independent

Use this script to manage any type of league: single elimination, double elimination and round robin tournaments.

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Developer: Krystian
License: GNU General Public License (GPL)
Operating System: all with PHP & MySQL

Chess League is a new open source online chess league management system.

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Developer: quirm.net
License: Freeware
Operating System: php mysql

It's free multilang script, which allow you to create your own league based on PHP & MySQL.

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Developer: Claymore
License: Freeware
Operating System: any with PHP + MySQL

Think for team sport clubs and leagues, phpMySport is a content management system that allows you to easily create and manage a website.

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Developer: Jerome Place
License: GNU General Public License (GPL)
Operating System: Apache, IIS

A comprehensive and remarkable database of players, recent games, teams from all the leagues in Scotland and England, as well as information on the teams in all the major European Leagues plus the news on International squads.

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Developer: Ah Tiong
License: Freeware
Operating System: Linux, Unix, Windows

PHP Competition System is a web based management system for competition on collective sport like football, handball, volley ball, rugby.

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Developer: Gallene Eric
License: Freeware
Operating System: Linux, Unix, Windows