I’m glad to announce that I put together a (really minimal) Crystal kernel for the Jupyter notebook!
The code is basically a port of the IRuby kernel, and the backend is currently based on icr, but that might change in the future.
For now, the name is “icrystal”, but if you have better suggestions, please comment. Go has one named “gophernotes” for example, and it sounds cool.
EDIT: added link to repository.