Design System manager
DSM like InVision or Toolabs.
Components, text scales, colours and much more.
Matt Brogan commented
Yes, I know this is a little off topic from pure product design and many other third party plugins do it really well however a DSM that can sync changes, and push and pull design system assets at an online source for developers, designers and anyone who would need to maintain the branded styles. Very much how Invision DSM works where companies can create a source of truth for maintaining styles. Yet update via Xd and push to the DSM.
It's great having these components with Xd but with no real connection to developers its annoying because the cost of other products guides designers to use other Ux tools. Figma has a sweet plugin with Toolabs where designers create the Ui and add all the design system assets from Figma (turn into tokens) a one click.
It would be really cool to see Adobe smash a DSM.