I received an email from Wiley announcing their online materials, tools, and eBooks are being made freely available to instructors and students. You just need to request access.
Knewton https://www.knewton.com/courses/
zyBooks https://www.zybooks.com/catalog/
Looking through their catalogs, they offer a wide range of disciplines (computer science, engineering, sciences, mathematics, business, languages, and more). This may be a great resource to save time in creating material in an online format if a solution or partial solution already exists.
Information courtesy of David Toth