OASIS offers users worldwide the ability to search a range of OER materials including textbooks, courses and corresponding materials, interactive simulations, public domain books, audiobooks, modules, open access books, videos and podcasts on a variety of topics - from anthropology to zoology. OASIS also is the only tool that allows users to limit searches by creative commons licenses or by faculty review.
Although not strictly for libraries, there are some great free webinars here, including archived ones. I attended an outstanding one on PowerPt with Richard Goring
Shows the best website winners using one of the best sites, Book Creator. Some of the slides incorporate videos showing how the sites can be used. This was used in a webinar 9-4-18