Tools for generating chords, matrixes, and staff paper

This is the best matrix generator I have seen.  Easy to use! 

Another 12 tone Matrix Calculator that allows you to differentiate between absolute pitch method and the traditional method. 

Here is a good chord calculator for tonal harmony.  Choose the key on the right and then choose from diatonic traids, borrowed chords, secondary dominants, and secondary leading tone chords. 

Again from the same site, a staff paper generator.  Choose from 2-4 staves and edit the clefs, braces, and brackets.