Fine Tuner - Fine Tuner is a minimalistic guitar tuner that utilizes your device's built-in microphone.
guitarLayers - guitarLayers is a professional macOS guitar learning software.
Metronomus - Powerful and beautiful online metronome
Gitarrero Beginner - Gitarrero Beginner is a multi-featured, and easy-to-use guitar school developed as a guide to help you learn guitar skills and play them comfortably.
LINGOT - Musical instrument tuner, LINGOT is a musical instrument tuner.
TrueFire - The Best Guitar Lessons Online Fast. Easy. Fun.