StatusNet - The StatusNet platform enables communities, brands and organizations to incorporate micro messaging...
Frysbe - Frysbe: Make global friends at random and the fling app comes up with features to send messages to strangers from every corner of the world to expand your social circle.
Octopress - A static blogging framework for hackers, based on Jekyll
PenPal World - Connect with people all over the world
TidyCMS - TidyCMS is a lightweight, static html file CMS.
Unbordered - Unbordered app comes up with features to help you in finding the perfect language practice and exchange partners so you can practice foreign languages right through your mobile phone.