I was going to put up one of my games online anyway, so I figured I'd make it more educational: this could be an online repository of javascript nim games with links to the corresponding source code.
Details at https://nimgame.online
If nothing else, it has two of my games on it :). But, I'm happy to put more up if anyone volunteers.
(My two games use my webterminal library, so they are essentially shell games. But that need not be an expectation; any javascript game is okay.)
John
P.S. The website is also written in Nim. You are welcome to look at it on the repo, but don't expect it compile it on your machine. I've got about 3 more libraries to put up on nimble still. So much to do...