For Guitarists: Freeware: Guitar And Bass
Link: Guitar and Bass Software
Download: Guitar and Bass Software - Download
Note: The install routine offers to install Babylon Toolbar [and make it your homepage and default search provider] and Snap.do [an make it your homepage and default search provider] Deselecting these does allow the install to proceed.
Once installed and running the interface carries adverts on the right-hand side of the screen:
Guitar and Bass in use: