TuxGuitar is a free version of Guitar pro that can open both power tab and all types of GP tabs (except 6). You can also convert tabs into midi files and other types of tab files.
It's really usefu and completely free. The sounds only midi quality though.
Musical Theatre! *jazz hands*

...what am I doing on this site...
i dont really think it should be called a free version of guitar pro. It's a freeware that can open pretty much all animated tab files. and not much for a thread topic
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