At the ID CoP on January 8, 2020, I presented on Gamification of Teaching. Here are the presentation slides: https://docs.google.com/presentation/d/1bbug7_iDCm2TQXCAXKPW5I8U6zTi5MjXTlX2nwZy-p0/edit?usp=sharing
I used https://jeopardylabs.com/ to create a Jeopardy activity, a free tool with no registration required. I also used a free buzzer app, https://buzzin.live/ with no registration required.