Kali Linux is designed for security professionals and packed with more than 300 security testing tools. Version 1.0.6 released on January 9, 2014 delivers a host of improvements, including the switch to Debian and use of an FHS-compliant system. The free version is included with Kali and can be upgraded to the Professional version for $299 per year. John the Ripper is another command line-based password cracker that’s noted for its speed. Maltego is an amazing relationship analysis tool that can track who or what is connected to what or who.”]
Source: https://www.csoonline.com/article/3335024/top-10-security-tools-in-kali-linux-1-0-6.html