How to connect to a Mac from Windows or Linux?

I was figuring out how to do it: should I install something like a dedicated Mac Terminal Server (e.g. Aqua Connect) or compile a VNC from source? Well, neither one. I can use the built-in VNC available with the latest Mac OS (Leopard and Snow Leopard have it).

Just open “System Preferences” → “Sharing“, tick the “Screen Sharing” box and, with this option selected, click on the “Computer Settings” and setup a VNC password. If you want a step-by-step, follow this how to.