Where do you get Xbox Live hacking software?

You cannot, it is against the TOS of Microsoft's Xbox to tamper with their services. ALL of the sites that state that obtaining free Microsoft points or Xbox Live membership is false. The cards are not active until they are purchased at the register. Anyone claiming to have a code generator for this purpose is misleading and may be just phishing for your email or any other information they can get from you without your knowledge. The chances of generating or guessing a code that's active (which hasn't been redeemed) is basically impossible.