Yesterday, VMWare announced one of their products, VMWare ESXi, will be provide for free later next week.
Very interesting for whom want test, learn and work on a bare-metal virtualization software, hypervisor, for free.
This is a little bit different than VMWare Server, but also make a more robust and perfomant system. The main difference is about host OS, VMWare Server need one whereas VMWare ESXi don't need it - it's bootable -, however it required a dedicated machine.
A test should come soon here.