Kali Linux is completely free and is very similar to BackTrack. Kali Linux is developed, funded and maintained by Offensive Security, a leading information security training company. Kali contains several hundred tools which are geared towards various information security tasks, such as Penetration Testing, Security research, Computer Forensics and Reverse Engineering. Kali Linux is a Debian-based Linux distribution aimed at advanced Penetration Testing and Security Auditing with more than 600 penetration testing tools. Diff VCenter 5.5 appliance and vCenter on WIndows.
