Free ebooks from Junior Library Guild (elementary, middle, and high school levels)
Mackinvia (website or app) See Main Page for details and the video tutorial (we just got over 300 K-12 classics for free through this shutdown)
Kern County Public Library Card: Video: How to sign up for an Instant eCard using your mobile #
Many classroom novels and classics are free at Project Gutenberg
30 days free of Scribd with no credit card required
Audible has released some free audiobooks in a variety of languages