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Today we are discussing about top 15 advanced operating systems which has great penetration testing or ethical hacking tools. the top Os on this list is my favorite Linux distro Kali Linux because it is very popular in pentesting and it is developed by the same team of BackTrack (Offensive security). i am not including BackTrack on this list because it is no more available officially on their website and the next version of BackTrack is Kali Linux. the listed operating systems are here based on Linux kernel so it is all free operating systems. (Included download links for all Os) :)

I am recommending you to read my earlier post to understand more about Linux distros related to hacking security: Linux Powerful Distros For Hacking Or Security: Kali, Tails And Qubes

Further reading