Guitar Pro is first and foremost a program designed to edit tablatures for guitar, bass, and other fretted instruments from 4 to 8 strings.This app doesn't have any features at the moment.
Songsterr is an archive of guitar, bass and drum tabs. It is collaboratively built and maintained by your fellow music lovers. Anyone with Internet access can contribute new tabs and make changes to existing ones.
The Tonelib JAM is a software for creating, editing, printing and listening to tablature and sheet music for guitar and other fretted instruments. You can use Tonelib JAM for regular guitar practicing, for learning songs or for advancing your performance skills to the next level.
alphaTab is a cross platform music notation and guitar tablature rendering library. You can use alphaTab within your own website or application to load music sheets from files like Guitar Pro or use the built in markup named alphaTex.
NtEd is a GTK+ score editor. It intends to be really WYSIWYG: what you see on the screen is exactly what you get on printer output. It supports up to 4 voices per staff, drum notes, 5 lyrics lines, N-Tuplets, context changes, repeats with alternatives, configurable music...
TablEdit is a program for creating, editing, printing and listening to tablature and sheet music (standard notation) for guitar and other fretted, stringed instruments, including mandolin and bass.