Jupyter is a project started by the Python community, that was originally called IPython Notebook (IPython for Interactive Python), and aiming at more interactive computing, through a new interface appropriate for the academia: Notebooks.
The project opened to other scientific languages, turning into Jupyter (for Julia, Python and R).
You can get a Jupyter kernel for Scilab here: https://github.com/Calysto/scilab_kernel
as well as Octave: https://github.com/Calysto/octave_kernel
You can donwload this Notebook to get started with Scilab in Jupyter:
Gist snipet exchange
Gist is a service provided by GitHub to exchange pieces of code. You can create two kinds of gists: public and secret. Create a public gist if you're ready to share your ideas with the world or a secret gist if you're not. This is very appropriate for notebook, that can be natively shared and rendered:
ByteCode Webinar: Teaching Online with Live Code Using Jupyter-Scilab
Set up a Jupyter Notebook Server on AWS
Jupyter Notebooks on AWS EC2 in 12 (mostly easy) steps
Tutorial in French
Octave in Jupyter