As a DJ I've been aware of Mixed In Key since 2006, for their respected key detection software. In more recent years they've been releasing various production plugins.
The latest is called Wingman, and is an "ideas generator" for your DAW that can suggest chords and basslines by analysing the audio you send - whether that's your own track or something that you'd like to remix.
It separates stems and allows you to mute or solo those alongside the suggestions it creates. You can then export audio or MIDI from both the analysed audio and the generated suggestions.
