Currently jupyter is included in the Solus repository. However, I found the notebook package is missing and I could not run jupyter notebook until I installed notebook using pip (pip3). I think notebook is essential for usage of jupyter and it would nice if it can be included in the repository.
Name: notebook (python)
Source code: https://github.com/jupyter/notebook/archive/5.2.1.tar.gz
Is it open source? Yes
Why should it be included? I think it is one of the essential packages for jupyter which is already in the repo. This package will make the jupyter package more complete.