This is a question about Go software, so it might not be the correct place to ask this, but I expect it to be the best place. ;)
I want to give a group of people a quick overview on Go but I don't have the resources to obtain actual material, so I was looking for a basic sandbox program and that turned out more difficult than I expected.
So, a single-screen / hot-seat go client. Where one (or two players) could run a human-human go game on a single machine (Mac/Windows/both but preferably Mac)