https://www.intuitive-audio.com/products/chord-composer

The Chord Composer is an extremely powerful MIDI FX plug-in which enables you to quickly and intuitively create fully customisable chord progressions with a few simple clicks of your mouse.

You can even assign the Chord Composer to control your favourite VST / AU instruments! Simply add an instance to a track in your workstation, reroute the MIDI Output, compose your progressions, then hear them play back in real time.

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https://mixedinkey.com/captain-plugins/captain-chords/

You can route the MIDI output from Captain Chords into all VST and AU units in real-time.

Compose the notes inside Captain Chords, but play them with your favorite synth. It’s super easy to establish a connection.