Free Scores
Commercial Sites
Student Portal
Summa Musica
Score Software
Other Music Software
Anthony Maydwell?

Anthony Maydwell.com

Useful Software

- TonalityGuide.com - Basic Chords and Progressions - Reference Guide - Exercises - Analysis Toolkit
- Dave's Free PC Software - Post Tonal Ear Training
- GNU Solfege Ear Training Software
- Take Note 2.12 by Jon L. Jacobi 
- Scala by Manuel Op de Coul 
- A Very Sophisticated Mode Generator
Michael Norris Mode Finder Online Mode Generator - a fixed, but large, set of predetermined modes
- SetFinder - A nifty piece of software to identify sets

Here is a MIDI sequencing package for those without a decent commercial equivalent.

Jazz for PCs.