guitarLayers - guitarLayers is a professional macOS guitar learning software.
Fender Guitar Tuner - Fender Guitar Tuner is a popular chromatic tuner that supports many musical instruments such as guitar, bass, and ukulele.
Fachords - Fachords is an online site that provides many resources that you can use to take your guitar skills to the next level.
Baglama Tuner - Baglama Tuner is a mobile application that baglama enthusiasts can use to tune baglama.
TrueFire - The Best Guitar Lessons Online Fast. Easy. Fun.
Cifra Club Tuner - Cifra Club Tuner is a multi-instrument chromatic tuner that fulfills user’s needs by providing them with a plethora of features to practice their respective instruments and get better each day.