Avatars United is a social network for virtual world avatars launched in early 2008. They’ve now launched “Avatars United Developer Platform” to allow each user to select and install applications that suit his or her particular character development targets in his or her particular virtual world setting. The platform supports applications for both avatars and groups. This in combination with game-specific APIs allows for some truly innovative social applications that could help enhance the gaming experience in the same way as game add-ons already have proven to do. Currently, 80 of the most popular online games and virtual worlds are supported, including World of Warcraft, EVE Online and Second Life. Check out WoW Armory or the newly launched EVE Achievements for some examples.

More info: OpenSocial API blog | Avatars United Developer Platform