Whether you wish to be a hacker who is interested in hacking wireless network, web app, database; cracking password, software....; or want to engage in cyber security related works in the future, Offensive Security's Kali Linux (a penetration testing OS) should be always your main "battlefield" and "experimental field".
The god knows who is using L0phtCrack as a security auditing tool to do the so-called password strength testing or recovery. I conclude that 90% of individuals are using it to violently obtain the passwords itself (through methods of dictionary, brute-force, hybrid attacks, rainbow tables, etc.). Whatever you's like to use it for, what we just can't deny is that it's the most outstanding one in similar software.
If someone says you want to use this kind of tool to verify the security of passwords or recover them, that would be a joke, I think. After all, a rule for secure enough password is very simple - Uppercase + Lowercase + Number+ Symbol (and > 8 characters), there is no need of any tool to validate it at all. The same for wireless network password, restoring it is meaningless - just reset the router to default, which is the most efficient way. So, obviously they are designed for passwords cracking only.