This is an open source project we made as a group during my Master 1 year. It allows users to make neural networks graphically.
There is a python backend and a web frontend based on grapheditor, draw.io's ancestor. I worked on the later part and some of the connection between the two.
It was interesting to explore a big codebase I didn't write, and I learned quite a few things during that project.
The project is now maintained by one of the original group members, and was improved in a second year with another group.