Operating system (OS) is the system software that helps to run the machine. Without OS machine is useless.
Hacker is a art of playing with machine to access other files or system with permession or without permission.
Mostly used OS is windows but it is rarely used for hacking purpose. linux os are mostly used for hacking purpose. Some of the mostly used OS are listed below:
1 Kali Linux
It is a linux based Operating system. it is the most used OS for hacking and security purpose. Every hacker must have knowlwdge of linux for hacking and security purpose. One can get kali linux from Here.
2 BackBox
BackBox is more than an operating system, it is a Free Open Source Community project with the aim to promote the culture of security in IT environment and give its contribute to make it better and safer. All this using exclusively Free Open Source Software by demonstrating the potential and power of the community. If you'd like to know more feel free to navigate in our web site and get in touch with us.One can get Backbox from Here.
3 Parrot OS
Parrot is a GNU/Linux distribution based on Debian and focused on Penetration Testing, Digital Forensics, Programming and Privacy protection. One can get Parrot os form Here.
4 DEFT
One can get DEFT form Here.
5 Live hacking OS
One can get live hacking os formHere
6 Samurai Web security framework
One can get this form Here.
7 Network Security Toolkit (NST)
One can get this OS form Here.
8 Bugtraq
One can get this OS form Here.
9 Back Track
This OS is officially not aviable. This OS had been upgraded to kali linux
10 Pentoo
One can get this OS form Here.
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http://cyborg.ztrela.com/
I agree with all of this, with maybe the exception of backtrack. It was great, but as you said, it has been phased out with Kali.
Why not throw BlackArch up there in it's place?
https://www.blackarch.org/