Online Tools
MetronomeOnline.com : Online Metronome.
DanMan's Music Guitar Tuner : Online HTML Tuner.
PureTone.com CyberPitch Instrument Tuner : Online Flash Tuner.
MusicEffect.com Chord Finder : Online HTML Chord Chart Finder.
Music and Tablature Software
Power-Tab.net : Home of Power Tab Editor, the Guitar and Bass Tablature Editor for Windows
Online Guitar Information and Instruction
Periodicals
Acoustic Guitar Magazine
Guitar One Magazine
Guitar Player Magazine
Guitar World Magazine
Publishers
Hal Leonard : The world's largest music print publisher
Mel Bay : Large instructional publisher