"ChartaCourse’s mission is to make legal education better for law students by providing better materials at a lower price [$59 for online casebooks as of June 2022]. ChartaCourse also offers online study guides in a concept map format that students can use as supplements.
Casebooks available for Property, Evidence, Criminal Law, Criminal Procedure I, Constitutional Law: Powers, Torts, Civil Procedure, Business Organizations, Criminal Procedure II, Constitutional Law: Liberties, Contracts, Sales, Family Law, Bankruptcy, Administrative Law.
Some law professors who create their own textbooks freely share that material with other professors and their students. Links to some of these sources are listed here. If you have suggestions for other links to add, please contact me.
CALI offers casebooks and online lessons. To create a CALI account, email reference@law.villanova.edu.