Roomvine - Chatrooms for real life venues, neighborhoods and events
Charity Engine - Charity Engine takes enormous, expensive computing jobs and chops them into 1000s of small pieces...
Jodel - What is Jodel all about? Jodel is the community that shows you what's happening in your area in real-time.
BOINC - BOINC is an open-source software platform for computing using volunteered resources
Yakko - Anonymously post, comment, and interact with people at your university.
Apache Mesos - Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.