Frettable
Frettable Inc.
Guitar2Tabs - Note Recognizer
Klangio GmbH
Flat: Music Score & Tab Editor
Tutteo Limited
MuseScore: sheet music
Musescore Limited
Guitar Tabs X
Ultimate Guitar: Chords & Tabs
Ultimate Guitar USA LLC
Chordify: Song Chords & Tuner
Chordify B.V.
TEFpad
Matthieu Leschemelle
Tomplay - 自带伴奏的乐谱
Tombooks SA