
1- Kali Linux:

Kali Linux is a Penetration Testing Distribution based on Debian. Developed by Offensive Security. The first release was on February 5, 2006, it’s a completion of BackTrack Linux Project. It used to use GNOME as a Desktop Environment. Nowadays Kali Linux became a Rolling release Distro. It has a lot of tools in the Kali Repositories. Download. Kali Linux Ranked number one in Top 10 Penetration Testing & Ethical Hacking Linux 2018.
Also Read Complete Kali Tools tutorials from Information gathering to Forensics
2- Parrot Security OS:

Parrot Security Operating System is a Penetration Testing & Forensics Distro dedicated to Ethical Hackers & Cyber Security Professionals. It has a big repository that collects a lot of amazing hacking tools for newbies and experts. Developed by FrozenBox. The first release was in June 2013. It used to use MATE as a Desktop Environment it’s based on Debian like Kali Linux. Download.