To clarify about the Cobb Accessport, take a look on Cobb's website for the list of Cobb Accessport tuners througout the country so you can see who is near you. These tuners have the software to work with the Accessport. Other tunes from a protuner are often "open source". These can be flashed onto your ECU but cannot be saved onto the Accessport (maybe the newest version can, but I don't know as I have an older one). Multiple tunes, both off-the-shelf and protunes, that are Cobb compatible can be saved onto the Accessport so you can switch between tunes at home. They also read and clear check engine codes, and display/log multiple engine sensor data streams.
