WordPress started as just a blogging system, but it has evolved to be used as an full CMS.
Joomla! is an award-winning CMS, which enables you to build Web sites and powerful online applications.
webSPELL is a free CMS which was especially developed for the needs of esport related communities.
Neofrag is a CMS for gamers and eSport organizations. Project is under development.
EQdkp Plus is the Tool for managing your Guild and Raids. EQdkp Plus supports a lot of Games.