I have been working on a project since the end of last year: adapting an existing open linear algebra textbook: Linear Algebra with Applications by W. Keith Nicholson to make it more interactive.
You can read or download the adapted version here: https://ecampusontario.pressbooks.pub/linearalgebrautm/
To see the H5P elements, it’s best to view the book using your web browser. Once you download it as a PDF file, you won’t be able to see those H5P interactive elements. Enjoy!