There are hundreds of apps compatible with Canvas listed on
EduAppCenter. You can add them by going to your course -> Settings -> Apps. One example third party app is the
Piazza question & answer forum tool. To add some third party apps, you may need a consumer key, shared secret, and launch URL (for example, see these
instructions for adding Piazza to Canvas). If you cannot find these through a search or through contacting the third party vendor, please contact your IT support.