More options are out there!
There are too many chemistry textbooks to list here. Additional searching in the three main textbook repositories listed for all disciplines is recommended.
OpenStax, BCcampus, and Open Textbook Library
There are too many open courses to list here. This is just a sample. Search UCI Open, MIT Open Courseware, and LibreTexts for more options.
Please see the "Open Image Databases" tab on the main page.