Melody Generator - Randomly generated MIDI melodies you can use for free
Chord NOTE - Easily find the right chords to match a melody or musical phrase.
AudioCipher - AudioCipher is the text-to-midi DAW plugin that transforms words into MIDI melodies and chord progressions.
Plugin Boutique - Inspirational MIDI effect that makes finding chords and progressions intuitive and fun
Captain Chords - Write chord progressions in your favorite DAW
Instachord - MIDI Processing Plugin that helps you play chords and chord progressions faster and easier.