UltimateGuitar.com - Learn how to play your favourite songs on guitar or ukulele
Metronomus - Powerful and beautiful online metronome
Guitaa.com - Turn ANY song into chords, play along with interactive chords and diagram, transpose, loop, tempo control.
afractal Metronome - Highly perfomant, easy to use, minimalistic digital metronome desktop app.
ChordU - Extracts chords from any song, integrated YouTube.
TempoPerfect Metronome - TempoPerfect is a free software metronome.