Program to create Unity Learn style workflows

I'm not sure if anybody would know this but I really enjoyed how Unity Learn modules were setup and include quizzes at the end. I am looking into creating a similar structure for onboarding new people. I think that this would be a great way to keep people engaged and know what they need to do, especially in a remote environment.

If anybody knows if it was developed in house or other products that could be used to create a similar style, I would appreciate it. otherwise, I might need to create my own from scratch, if I can find the time.