BOINC - BOINC is an open-source software platform for computing using volunteered resources
Thankbot - Drive more business with handwritten notes
Apache Mesos - Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
Fountain Greetings - Handwritten cards. Curated gifts. Right at your fingertips.
JPPF - The open source grid computing solution.
Bond - A simple app that reminds you to keep in touch with people