Plugin Boutique - Inspirational MIDI effect that makes finding chords and progressions intuitive and fun
Guitar Pro 7 - Create, play and share your tabs
Captain Chords - Write chord progressions in your favorite DAW
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Instachord - MIDI Processing Plugin that helps you play chords and chord progressions faster and easier.
OpenMPT - OpenMPT is a popular tracker software for Windows.