BOINC - BOINC is an open-source software platform for computing using volunteered resources
Ariuum - Online debate and discussion streaming platform
Apache Mesos - Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
roundtable.audio - Live audio chat rooms to discuss anything on the internet
JPPF - The open source grid computing solution.
YEAY - QVC + Tumblr + Snapchat. Vertical video shopping.