Linux Based Operating Systems & Virtual Machines

Here you can find and share various Operating Systems (OS) and Parallels, VirtualBox and VMware virtual machines. We also have and are after various Linux pentesting distos (distributions). Links are normally in the first post in each thread below. For those who are not in the know, a virtual machine (VM) allows you to run an operating system inside an operating system. E.g: Run Mac OS X on Windows and so forth.