Virtualization
Below are the two most popular software's you can can use for creating a virtualized environment, VirtualBox and VMware.
Operating Systems
There is no limit on what Operating System you could virtualize, Here are some of the most famous ones.
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Default Username: kaliDefault Password: kali
Python
Seed Labs
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Default Username: seedDefault Password: dees
Useful Links
Installation
How to install kali Linux on Virtual Box
How to install Ubuntu on Virtual Box