Yeah we were partly inspired by it and the idea is similar. Although, they seem to focus on ML and Math, while we hope to cover as many topics as possible. Another difference is that we don't host any content, but just links to resources.

For rendering the maps we're using React and D3. D3 is used for calculating the position of elements on the page and, React for rendering and manipulating those elements. Before we had a ref and let D3 manage everything on that ref, but it got unmanageable quite fast.

EDIT: if you're interested here's an article that explains what I'm talking about https://medium.com/@Elijah_Meeks/interactive-applications-wi...