Here is a list of resources that I use to practice and grow as a musician.
Tuners & Metronomes
Google Metronome (in browser) FREE
Cello Drones [Practice with these to train your ear]
TonalEnergy Tuner & Metronome (Apple Iphone & Android App) $3.99
Drum Beats + [For those looking to practice with more than just a click] $4.99 w/in app purchases
Dr. Betotte [Metronome that you can program to move between tempos] Free / $9.99 for premium
Snark Instrument Tuner [ A clip on tuner great for buzzing or on you instrument]
Sheet Music, Chords, Lead Sheets, & Lyrics
Sheet Music Plus [Great online store for purchasing sheet music]
Musicnotes.com [Online store with a wide variety of lead sheets for popular genres]
iReal Pro [App with backing tracks and chords for Jazz standards & More] $13.99
Ultimate Guitar.com [Chords + Lyrics]