Dr. Zarkov writes "I'm trying to set up a facility to enable testing software on various software/hardware platforms (all Windows, currently, but conceivably that could change "in the future"), without all the drawbacks of maintaining the actual physical platforms. Ideally, I'd like 2 or more testers to be able to call up a given virtual machine remotely, and test concurrently, with or without interaction between the testbed instances. VMware's Lab Manager product looks like it could fit the bill, although it may be over budget. Does anyone have any experience with that product? What about alternatives, especially using FOSS? Also, has anyone found any good comparison studies for any of the numerous virtualization products available? (I already checked out the recent slashdot article comparing Xen and OpenVZ)."