Quoddy is an open source enterprise social network, which shares a common "look and feel" and substantial functionality, with consumer facing social networks like Facebook and Google+, as well as proprietary products from Jive Software and Yammer. It makes up one component of the Fogcutter Suite. It is intended mainly for organizational use and therefore has capabilities which make it uniquely suited to provide the social fabric to support organizational knowledge sharing, knowledge transfer, collaboration, and decision support.
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.