Where to find skill trees?

Question

IT education

Given: We
are developing a resource for finding young professionals in student projects. To describe specialists, we use, among other things, a list of skills that he owns. Here you can see them , the list is in the filter. Now we are expanding the list of skills. Skills are collected in a hierarchy by subject.
Find:
Where are the pre-built skill trees? Particularly interested in engineering and IT areas.
Thank you!