Fretastic - An interactive fretboard that lets you look up scales and chord in CAGED, 3nps and other shapes.
UltimateGuitar.com - Learn how to play your favourite songs on guitar or ukulele
Guitar Dashboard - Open-source interactive music theory for guitarists.
Guitar chords and tabs - Download this app from Microsoft Store for Windows 10, Windows 10 Mobile, Windows 10 Team (Surface Hub). See screenshots, read the latest customer reviews, and compare ratings for Guitar chords and tabs.
ChordU - Extracts chords from any song, integrated YouTube.
AudioTheory Guitars - The ultimate reference tool for guitar notes and chords.