"Edu Apps is an open collection of learning apps built on LTI™. These apps are all live and can be used in your class today!
Not familiar with LTI? Basically it's like Facebook apps or Google widgets, but interoperable between lots of edu tools. Browse this site to find tutorials, extensions and other resources. Apps with a gray label under their configuration xml support LTI extensions that won't work in all systems. Currently these LTI extensions are only supported by Canvas.
NOTE: This site is run by Instructure. The official IMS LTI site is available here. The tools listed on this site should work in most systems."
More info http://www.edu-apps.org/index.html