You can not "crack" such password as by definition the hashing is not reversible.
If you have a list of possible candidates you can try to see if they match, after redoing the hashing with the appropriate salt.
If you do not have any starting list you are left with a brute force approach, trying all combinations until you hit the good one. Note that if the password is good enough security wise you will never find it by brute force.
John the Ripper (< is a well known software for brute force cracking.