Ripchord is a free VST3 from Trackbout.
It's kind of like the chord portion of Cthulhu in that it lets you set up chords that are each triggered by a single keyboard press.
I find it's easier to use than Cthulhu as it lets you easily modify the chord you are creating. You can also name the chord you are creating.
You can create elaborate chord progressions with each chord being played just using one finger. (So, it's a great choice if you are not a very good keyboard player... like myself!)
There is also a user area that allows sharing of created chord presets.
It's an excellent freebie:
https://trackbout.com/ripchord