The latest tool of 2014 is Winrar Password Unlocker.
Reachable at rephacks.net/wrarunlocker/
Winrar Unlocker is free and it will always be free. No need to pay for some Winrar Password Removers which doesn't even work or use trial versions.
Just in case, below is listed some SW, trial versions of which can be used.
1. ZIP RAR ACE Password Recoveryhttp://www.keylack.com/zip-rar-ace-password-recovery.html
2. RAR Password Crackerhttp://www.rarpasswordcracker.com/
3. or ALZip, an archiving software which also supports cracking RAR passwordshttp://www.altools.net/
4. http://www.passwordunlocker.com/rar-password-recovery.html