Modelbook is a social networking platform that features most mainstream social networking features: Paypal subscriptions, friends request/approval, shout-outs, wall castings/events, a forum, profile approval/private profiles, image galleries, MP3 upload, Zip code radius search, Facebook-style chat, and more.
Dianara is a client for the Diaspora social network. It allows users to manage their Diaspora social network accounts without using a Web browser. Currently, it’s basically an empty shell. It allows you to enter your Diaspora ID (username@podname) and authentication token, and your last 15 public posts are fetched and presented. There is some basic Markdown support.
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.