FYI TuxGuitar is a FOSS player that can load/play/edit PowerTab and GuitarPro files. Multiplatform too. It's not completely 100% bug-free, but it's good enough to load and play most tabs flawlessly.
Or for a more robust piece of software (especially if you do tabbing/composing yourself or you want to generate/edit a tab from a MIDI file), MuseScore is also FOSS and can import GuitarPro files no problem. With its recent UI overhauls it's really become top-notch IMO.
i didn't realize musescore opened guitar pro 7/8 files (which is what sheet happens publishes)! sadly tux guitar support stopped at gp5. I will definitely be checking out musescore, thanks for the rec!
Or for a more robust piece of software (especially if you do tabbing/composing yourself or you want to generate/edit a tab from a MIDI file), MuseScore is also FOSS and can import GuitarPro files no problem. With its recent UI overhauls it's really become top-notch IMO.