My wife is working on her Master's degree in Library Science at the University of North Texas (go Eagles!) Being a tech person, of course, means that I get to participate in some of her assignments. This has proven to be not only fun, but very educational for me as well.
One resource that I found that I would like to share is their "Best Websites for Teaching and Learning 2018" There are some really GREAT sites here for teachers and students and the best part is that a huge percentage of them are also very much FREE!
Best Websites for Teaching & Learning 2018
Best Websites for Teaching & Learning 2017
Best Websites for Teaching & Learning 2016
Best Websites for Teaching & Learning 2015
Finally, from the AASL website, we have the list of landmark websites. They are all free and "user friendly and encourage a community of learners to explore and discover and provide a foundation to support 21st-century teaching and learning."
Landmark Websites for Teaching & Learning