Easily record and edit videos of action on your computer screen.
Drive allows you to create web-hosted documents, presentations, forms etc. Each document can be linked to from D2L and centrally maintained (i.e. you can update the google document and it will automatically update within D2L). This can be useful especially if you are using the same material for multiple classes.
"Easily create ebooks, typeset PDFs, and webbooks. Choose from professionally designed book themes. One button publishing." Free and priced options.
Online photo editor and drawing tool. Requires Flash
Here's brief video explaining how to use tools like YouTube, Vimeo, SoundCloud and Flickr to share your course materials under a Creative Commons license: