Apps (these are apps I use on my iPhone/iPad - I'm not sure if they are available on other smart phones but it is worth looking)
Tonal Energy - visual tuner with digital "oscilloscope," tone generator, and utilitarian metronome (this is the smiley face app I use in class)
Tempo by Frozen Ape - great metronome with lots of features
Garage Band
iReal Pro - great for practicing improvisation. This is what I use to create the backgrounds for our jazz tunes
Helpful Websites
Free online metronome: http://www.metronomeonline.com/
Another free online metronome: http://www.webmetronome.com/
Free online musical dictionary: http://www.music.vt.edu/musicdictionary/
Free online Music Theory Training: http://www.musictheory.net/exercises
Free online Ear Training Games: http://trainer.thetamusic.com/
Free online tuner: (If you find a good one, let me know!)
Free recordings of a lot of our music: http://jwpepper.com
Instrument Specific Sites
For Trumpeters: http://www.8notes.com/trumpet/
For French Horn Players: http://www.frhorn.com/info/
For Trombonists: http://www.trombone.org/jfb/
For Tuba/Euphonium/Baritone Players: http://www.norlanbewley.com/
For Saxophonists: http://www.saxontheweb.net/
For Floutists: http://www.flutemonkey.com/
For Clarinetists: http://clarinet-central.com/
http://www.clarinetinstitute.com/CI%20Solo.htm
For Oboists: http://oboeinsight.com/instruction/things-you-should-know/
For Bassoonists: http://mariedwivkidz.hubpages.com/hub/Bassoon
For Percussionists: http://www.vicfirth.com/education/rudiments.php
http://www.drummerworld.com/drummervideo.html
http://www.steveweissmusic.com/category/bargain-basement
Software
“MakeMusic” https://www.makemusic.com/
Launch MakeMusic. Clip on the microphone, and start practicing. One practice session with MakeMusic (formerly SmartMusic) will show you the difference between practice and interactive practice. At a yearly subscription rate of only $40, it’s easy to own the most powerful practice tool and accompaniment library on the market today.
“Musescore” http://musescore.org/ Free download for music notation software.