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.
Quoddy is part of the Fogcutter suite of tools for building intelligent applications. It is basically a sort of "mini Facebook"-like social networking interface. It builds on the APIs for social-graph management, activity stream, activity profiling, tagging, etc. It provides the front-end for managing connections and for letting users provide information about themselves, their interests, etc. But unlike Facebook, there are no silly Pirates vs. Ninjas or Farmville applications.