Tux Guitar is a guitar-focused tab and music notation editor/viewer/player.

Features:

• Tablature editor
• Score Viewer
• Multitrack display
• Autoscroll while playing
• Note duration management
• Various effects (bend, slide, vibrato, hammer-on/pull-off)
• Support for triplets (5,6,7,9,10,11,12)
• Repeat open and close
• Time signature management
• Tempo management
• Imports and exports gp3,gp4 and gp5 files
• Also imports other file formats, can export to Lilypond, and more.