Frettable
Frettable Inc.
Guitar2Tabs - Note Recognizer
Klangio GmbH
MuseScore: sheet music
Musescore Limited
Flat: Music Score & Tab Editor
Tutteo Limited
Sing2Notes - Sheet from Vocals
Ultimate Guitar: Chords & Tabs
Ultimate Guitar USA LLC
TEFpad
Matthieu Leschemelle
Chordify: Song Chords & Tuner
Chordify B.V.
Piano2Notes - Notes from Piano