Aqua Connect’s Terminal Server solution allows the Mac OS X platform to be deployed to multiple devices simultaneously. The software product allows Macs, PCs and handheld devices to remotely connect while being isolated. (Similar to VNC, but with a terminal server there can be multiple people using it at the same time with their own desktop.)

The pricing is not clear as they require you to write in with your information and needs to get a pricing quote. There is a trial offer as well.

This is the only Terminal Server for Mac that I know of right now. (Maybe someone else has another option?)

If you are in the need, head over to the Aqua Connect Website.