VNC Server for 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?

Just to clarify: this question is about Mac OS, not Mac OS X or macOS (Sierra/High Sierra).
There is already VNC-server software builtin to the macOS. Go to System Preferences > Sharing and tick the box for Screen Sharing on the left. Notice the Computer Settings… button on the right. Click that and you will get a drop-down dialogue with an option for "VNC viewers may control screen with password:" Enable that, and you should be able to use whatever VNC-client software you choose. I am not very experienced, but my research led me to choose TigerVNC, which I've used with success on Linux to control my Mac.