From the (super short) Appscope listing:
Coursables is a virtual classroom platform. It allows instructors to teach their students in Real Time.
The URL to tap on or type in is coursables.com .
Of course, you can turn this into an 'app' yourself with PAWA or just pin it 'as is' on your Start screen. Or just add it as a 'Favourite'. It's up to you. If you're confused by the different PWA options then check out my feature here.
Here are some Coursables PWA promo screens: