Time Out - Break timer with micro-breaks for Mac OS X.
Recess - Recess reminds you to take breaks from your computer after a set amount of time.
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
The Hike Game by Arc.dev - A "Choose Your Own Adventure" Zoom game for remote teams
StretchMinder - Work break timer with guided movement & breathing exercises
Zoom Games - Curated and filterable list of games to try on video calls