ST Selfcare
SWIFT TEC
ST Courier
Tulips Media
ST Service
Sharing technologies
ST TV
Sat-Trakt doo
Pro Guitar Tuner
ProGuitar
Guitar Tuner - Simple Tuners
ZipoApps
Guitar Tuner Pro: Music Tuning
MWM - Music and creative apps for Android
Guitar Tuner: Pro Tuning App
UXAPPS LTD
GuitarTuna: Tuner,Chords,Tabs
Yousician Ltd.
Fender Guitar Tuner
Fender Musical Instruments Corporation