https://itunes.apple.com/us/app/chordbot/id394754767?mt=8&ig...
https://prochords.dk/
https://itunes.apple.com/us/app/guitar-chord-progression-son...
https://itunes.apple.com/us/app/suggester-chords-that-work-t...
There are also desktop apps and DAWs that have chord intelligence built in (e.g. Cubase and Reason do).