GuitarPro

GuitarPro screenshots

Guitar Pro is a tablature editor for guitar, bass, and other fretted instruments
GuitarPro 6.0 : Interface

Alternative downloads

MIDI Guitar
2.1
Convert your guitars analog signal into MIDI.
Tux Guitar
1.5.4
FREE
Edits tablature files in Java and supports GuitarPro and PowerTab files as well.
ultimate-guitar
1.0
FREE
Tool that you can use to search and browse for guitar tabs.