Scalaffinity is a library providing core functionality for any social networking Web site based on ratings and recommendations. In other words, it is a generic collective intelligence library. Examples of such sites are Anobii, Rate Your Music, and Filmaffinity. It is designed to act as an out-of-the-box model for such Web applications. Nevertheless, Scalaffinity is fully customizable, extensible, and scalable. It incorporates lessons learned while reading "Collective Intelligence in Action" by Satnam Alag.
ConcourseConnect is a social networking platform. You can build social networking sites including corporate intranets, business community add-on sites, enthusiast sites, business or product directory sites (like a chamber of commerce or yellow pages), or even stand-alone Web sites. Features include a full range of Web 2.0 tools: ratings, reviews, wiki, blog, comments, discussion forums, an ideas engine, and more. Users begin by creating a rich profile and joining groups. It is perfect for internal collaboration or as a customer feedback forum. The portal framework allows developers to plug in custom portlets and themes.
The Community Builder (CB) suite extends the Joomla! user management system, and allows you to use Joomla! to build a customizable social networking Web site. Its key features are extra fields in a profile, enhanced registration workflows, user lists, connection paths between users (friends), administrator-defined tabs and user profiles, image upload, front-end workflow management, and integration with other components, like PMS, Newsletter, Forum, and Galleries. Many plugins are available for adding more features. CB is compatible with all versions of Joomla! 1.5 native, Joomla! 1.0.x native, and Mambo 4.5.2-4.6.5. CB allows multi-criteria user searches, full field controls of core fields, AJAX email and username checkers, image and integer fields, custom validations, and many more features.