One that I stumbled upon created by Rimary Technolgy can be accessed by clicking on this link:
What I really like about this site is that you can add all the students in your class and save it as a unique url. You can also remove names when chosen as well as edit the time for the spin and edit the font.
Just be sure to allow the site to load!
Embedded below is a GIF followed by a 1 minute and 42 second YouTube tutorial.