The Poudre River Public Library has made downloadable books and audiobooks on Overdrive accessible with a temporary library card now and I believe that is good through June. There are also other downloadable services that can be used if they have a physical library card.
This is the link to get a temp library card:
This is a link to the downloadable Apps options:
Instructions on how to download, use and install databases:
A lot of publishers are releasing free materials because of schools closing.