AudioCipher - AudioCipher is the text-to-midi DAW plugin that transforms words into MIDI melodies and chord progressions.
Captain Chords - Write chord progressions in your favorite DAW
Melody Generator - Randomly generated MIDI melodies you can use for free
RapidComposer - MusicDevelopments RapidComposer: Music Prototyping and Automated Composition Software
Listen to Twitter - Convert the sentiment of any topic into a unique melody
Cthulhu - VST MIDI-FX plugin for harmonic inspiration