VNC Server for classic Mac OS?

I'm looking to run a VNC server on some of my Macs running Mac OS so that I can access them from other machines. Google searching for generic terms was useless, for example "VNC Server Mac OS" only gets you results about Mac OS X. More specifically, I'm looking for VNC server software(s) that would run on both 68K and PowerPC. What VNC server software is available for Mac OS versions 9.x and below? Just to clarify: **this question is about Mac OS, not Mac OS X or macOS (Sierra/High Sierra)**.