Music theory drills for key signatures, scales, note names, intervals, and chords

http://www.musictheory.net

http://www.emusictheory.com

Online Tuner

http://www.garlandisdschools.net/nghs/ngband/tuning.htm

Sight reading tips, scales, theory, and tips on ways to practice.

 http://www.practicespot.com/

Online metronome

http://www.metronomeonline.com/

Fingering Charts

http://www.alfred.com/sub_band/aoa/fingeringCharts.html

Drum Rudiments

http://www.vicfirth.com/education/rudiments.html

http://www.drummingweb.com/rudiments2.htm

http://www.pas.org/Publications/rudiments.html

Free Notation Software

http://www.finalemusic.com/notepad/

http://www.freebyte.com/music/#free_notation

String Pedagogy Notebook from the University of Vermont.

http://www.uvm.edu/~mhopkins/string/

Violin site containing practicing exercises with video clips.

http://www.theviolinsite.com/

Clarinet/Woodwind resources

http://www.anne-bell.woodwind.org