Open Educational Resources are ideal for online learning. They are free to reuse and redistribute to your students in Canvas. You can also retain a digital copy of a resource so that it is available to you for future semesters. You may also customize or remix content. When evaluating simulations, labs, etc. be selective about the source file and presentation format. For example, avoid content created with Flash which is largely not accessible and will no longer be supported after 2020. HTML5 files, on the other hand, can be viewed in most browsers and work with iOS devices. HTML5 can also be edited for customization or innovation purposes.
Online open textbooks are a great resource for scientific illustrations. Images can be reused in slides, handbooks, and virtual labs.