Unimus - Unimus is a Network Automation and Configuration management (NCM) solution designed for fast deployment network-wide and ease of use. Unimus does not require learning any abstraction or templating languages, and does not require any coding skills.
BOINC - BOINC is an open-source software platform for computing using volunteered resources
Oxidized - configuration backup software (IOS, JunOS) - silly attempt at rancid
Apache Mesos - Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
RANCID - RANCID - Really Awesome New Cisco confIg Differ.
JPPF - The open source grid computing solution.