Take a look at spiceworks. It's not open source but it is free. We use it with 3 techs and ~180 users. Works well for us.

http://www.spiceworks.com/

Has anyone done a recent true apples to apples comparison with Vmware, Virtual Server, and maybe Sen on the same exact hardware running the same guest VMs? Obviously it would have to have Windows as the host OS due to Virtual Server being Windows only but I would like to see how the various solutions stack up in different scenarios. Such as IO heavy, CPU heavy, sheer number of VMs that can be hosted, etc.
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