OFFICIAL PAGE: Remix
Remix, from Acon Digital, is a real-time stem separation plugin for your DAW that lets you remix vocals, piano, bass, drums and other instruments – all in real time!. Considering that the separations are performed in real-time, the results are quite impressive! Remix is available for both macOS and Windows in AU, VST, VST3 or AAX formats. Remix will run as an Apple Silicon Native plugin. Remix performs all processing locally on your computer. A demo of the Remix plugin is available. Full details at the link above.
Screenshot courtesy of Christopher Kissel