Wixie can be added as an external tool in Canvas. This page has instructions for adding Wixie in the course Settings we well as how to add Wixie as an item in a course module.
Open your course and choose Settings.
Click the Apps tab.
In the Filter field, enter Wixie.
Click the Wixie app.
Enter the Consumer Key and Shared Secret that you find on your Wixie administrator "Accounts" or "Student Accounts" page.
Click the Add App button.
Open your course and click Modules.
Click the plus button to add an item to the module.
From the Add pull down menu, select External Tool.
Click on the Wixie option.
Click the Load in a new tab check box.
Click the Add Item button.
When students click the Wixie item in the module it will open Wixie in a new tab.