Libravatar is software that allows domain owners to control how avatars (profile pictures) are served to other Web sites. It implements a modified version of the Gravatar API, adding a few features such as federation, LDAP authentication, and OpenID support. Libravatar powers libravatar.org.
Kune is a distributed social network focused on collaboration rather than just on communication. It focuses on online real-time collaborative editing (Wave-based), decentralized social networking (federation), and Web publishing, while focusing on workgroups rather than just on individuals. It aims to create online spaces for collaborative work where organizations and individuals can build projects online, coordinate common agendas, set up virtual meetings, publish on the Web, and join organizations with similar interests. It has a special focus on Free Culture and social movements needs.