Open Grid Scheduler / Grid Engine is the open source batch queuing system that succeeds the Sun Grid Engine. It is available at gridscheduler.sourceforge.net. We frequently and confusingly refer to this as "SGE", but that is the name of an older product - Sun Grid Engine - that we no longer use.
If you use Centos, then OpenGridEngine is included and you don't need to install it separately.
There are several versions of "open SGE" around. Most are fully compatible with SGE and seem about as good.
How to Get a queuing system working.