Jisko is a microblogging platform with support for mobile devices, tags, private messages, themes, avatars, mobile interfaces, customized backgrounds, a Twitter-like API, Twitter integration, and more.
Fat Free CRM is a customer relationship management platform. Out of the box, it features group collaboration, campaign and lead management, contact lists, and opportunity tracking.
A search engine with a RESTFul API and crawlers.
A next-generation implementation of the MPI standard.