Code CrackerCrack classic encryption codes
Code Cracker is a tool that can help to crack many classic encryption codes (developed before than the XX century). In some cases is able to crack the code by itself trying all the possible combinations ("brute force and ignorance"). For example, if you don't specify a key for Caesar's Code the message will be bruteforced.
Also note that Caesar's Code is the same as ROT: set the key to 13 for ROT-13.