Here's a zip with a password generator given the password you know. There's a readme inside with instructions and more info.

What it contains:
A java program that generates a bunch of possibilities > Write all the possibilities to a .txt file.
A powershell script that tries these (original by 2112).

https://dl.dropboxusercontent.com/u/43693599/BTC%20LTC%20Passphrase%20Recovery.zip

As for mac users, google: Powershell Mac