(If you don't know about it already.)
See www.tutorialspoint.com/compile_nimrod_online.php
It has an online Linux shell, online text editor with emacs and vim style, and a filesystem. You can publish your project, get a url, and it will be saved at that url. It would allow people to test Nim with only a few seconds time investment. A number of demonstration or tutorial programs could be saved and put on a link page.
To save project, look at top right, then Project->Rename Project, give it a name. Then Project->Save Project->GitHub. Then Project->Share Project. Click Yes, I agree. Copy the url and store it. Click ok.
Very cool. And their tutorials site too.
A Nim tutorial can be uploaded there, it hasn't one for now.