If you are looking for free softwares to extract rar files without password, then here are two simple tools to open locked rar file archives. Simply download them you might jut be able to extract files from password protected Rar files.
Unlock locked winrar archive (including SFX) allowing you to modify the content freely.With Winrar archive lock to prevent modification, people cannot change the content in it, cannot change the comment and so on. Through some patching of few bytes, you are able to modify your archive with ease.
> Download Winrar Unlock : Link
This program is intended to recover lost passwords for RAR/ WinRAR archives of versions 2.xx and 3.xx. The program finds by the method of exhaustive search all possible combinations of characters ("bruteforce" method), or using passwords from lists ("wordlist" or "dictionary" method). Self-extracting archives and multivolume archives are supported.
> Download RAR Password Cracker : Link
The program is able to save a current state (you can interrupt the program at any time, and restart from the same state later).
Note : Most of the time for password protected RAR files for eg.
Heroes.S02.E10.www.Free-Offline.com.rar the password is in the name it self. In this case the password is