Portable Music Theory and Aural Training
Trainers for iPhone and iPod:
  http://www.better-ears.com/en/
  http://quizlet.com
  http://www.tenutoapp.com/
  octavian, by bitnotic
  music theory pro
Synths and studio software programmers for iPhone and iPad:
  http://iprogrammer.com.au/?gclid=CJj78czzkK8CFUwmpAodGEld0A
Modular synth for iPod and iPhone:
  http://www.jasuto.com/site/
  http://www.musictheory.net/
  http://www.good-ear.com/
  http://www.solfege.org/
  http://www.earpower.com/
  https://www.msu.edu/~spangle9/
  http://www.trainear.com/
  http://www.singandsee.com/index.php?gclid=CP7ggNWLpZoCFRFMagodnjci8w
  http://www.merlot.org/merlot/index.htm
  http://cnx.org/
  http://flat5software.com/
OVERALL TRAINING
  http://www.ars-nova.com/practica6.html
  http://www.risingsoftware.com/auralia/
  http://www.risingsoftware.com/musition/
  http://flashcardsexchange.com/tag/Music?page1
  http://www.teoria.com
  http://www.musictheory.net/
  http://www.musictheoryresources.com/
  http://www.e-lr.com.au/
  dolmetsch online (plenty of resources, including blank score papers)
  http://www.merlot.org/merlot/materials.htm?category=2181&
  http://cnx.org/content/search?words=music+theory&allterms=weakAND&search=Search&subject=
  http://www.composertools.com/
  http://www.tonalityguide.com/index.php
  http://www.musicstudy.com/
  http://www.trainear.com/
  http://www.trainear.com/Ear_Training_Software_Comparison_07_2008.php
  http://www.iwasdoingallright.com/tools/v2_24/ear_training.aspx
  http://www.musictheoryminute.com/index.htm
  http://www.solfege.org/
STUDY MATERIALS
  http://socrates.acadiau.ca/courses/musi/callon/2233/scores2.htm
  http://www.bach-cantatas.com/
  http://www.scribd.com/ (check for orchestral scores in pdf for free download)
  http://www.recmusic.org/lieder/
PERIODICALS AND JOURNALS
  http://mto.societymusictheory.org/
  http://jmtp.ou.edu/
  http://www.garciamusic.com/educator/iaje.journal/iaje.jej.html
TOOLS
  http://www.geocities.com/dan_cavanagh/matrix.htm
  http://variations.sourceforge.net/vat/
  http://www.sonicvisualiser.org/
  http://www.jaytomlin.com/music/settheory/
  http://www.metronomeonline.com/
  http://www.cs.hmc.edu/~keller/jazz/improvisor/
Notation – Composition
Free music composition and notation program
  http://musescore.org/handbook/measure-operations
  LilyPond
Analysis
  Demo of Acousmograph:
    http://www.youtube.com/watch?v=qkuRIG3lwTE&feature=related
    http://www.ears.dmu.ac.uk/spip.php?rubrique32&cLang=de
  About iAnalyse:
    http://logiciels.pierrecouprie.fr/
More Compilation Lists Like This One
http://www3.northern.edu/wieland/theory/websites.htm
     / compiled by Suzanne Schmidt, 2008, revised and annotated by Melissa Cox, 2009