About BackTrack:
BackTrack is an Ubuntu-based distribution with a collection of security and forensics tools. It was created by merging Auditor Security Linux with WHAX

Runs in VMWare or VirtualBox

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About Open Virtualization Format (OVF)
Open Virtualization Format (OVF) is an open standard for packaging and distributing virtual appliances or more generally software to be run in virtual machines.

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About https://www.tradebit.com
Providing pre-installed virtual computers capable of running on multiple virtualization platforms. OVF Appliances from https://www.tradebit.com run under VirtaulBox, VMWare and other OVF supporting virtuilzation platforms.

https://www.tradebit.com provides the simplest way to implement your own virtualization solution quickly and easily.
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FREE Virtualization Platforms
VMWare Player https://www.tradebit.com
VirtualBox https://www.tradebit.com

VMWare OVF Tool Documentation https://www.tradebit.com