The software is Guitar Pro itself. It let's you draw parts and tabs and then you can play the music using the MIDI system of your PC. It is a very useful tool to practice bass and also useful for professional musicians looking for generation of good quality parts for guitar (they support most of the playing effects of guitar and bass like hammers, slides, pull-offs, dead notes, vibrato, etc.).
I use it almost every day.
http://www.guitar-pro.com/en/index.php