Check out https://cogenteducation.com/products when you have a chance. We make interactive case studies for biology that go much further than any textbook, digital or otherwise.
> I think most of my colleagues will be moved over to open educational resources within fifteen years, and I'm not sure there's long-term profit to be made in this market.
Sounds like he's looking for a free solution, not trialware.
I agree. It's rare for a teacher to pay for our cases out of their own pocket; it's generally the school system who purchases a package out of their yearly budget.
Sounds like he's looking for a free solution, not trialware.