DrQueue
DrQueue is a powerful open source distributed render farm manager, used for a range of applications across the visual effects industry and for general batch processing jobs in science, engineering and finance.
GRender
GRender is a freely distributed piece of software for the managing of render-queues for "Alias Maya" and "MentalRay for Maya". It handles render job queues without starting the Maya's interface, using all the power of the workstation. It is planned to make it a renderfarm manager for the 2.0.0 release.
SuperConductor
SuperConductor is an open source, multi-platform render farm controller for coordinated rendering control of multiple graphics/computation/rendering projects using multiple client apps like World Construction Set, Lightwave, Maya, Softimage XSI , POV-Ray, etc.
