Allows you to create interactive games and activities for students. This link is to the free tool, but the U of A plans to make a D2L-integrated version available to faculty soon.
Kahoot can be used for learning games/comprehension checks to create and use with students online.
Padlet is an easy collaborative online bulletin board.
Jamboard is a digital whiteboard with collaborative features (similar to other google suite apps).
Hypothesis allows users to annotate articles or web pages, and see the annotations others have made. U of Arizona recently purchased this for the campus, so it will be available within D2L.
Loom is a video recording tool. Allows user to share screen, video, and desktop.