Zygor's guide is strictly an add-on, but they're charging for the guide portion of it. If you know someone who has access to the Zygor add-on, then yes you can just install it and go. Whether that's "legal" or not, I have no idea and I won't pretend that I know the answer to that.
As for oFollow, it obviously looks like it relies on an external program to do some type of calculation for you, so I doubt you could just install the add-on and be able to use /follow as usual.
As per whether oFollow breaks the TOS is unknown at this point, so I have no issues discussing it until we find out more about it; but as the oFollow site states: Use at your own risk.
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