Just tried out Gather Town with my friends recently, and I'm really curious about how they made such a great stuff!
2D Rendering – Pixi
Animation – GSAP
Chat – Rocket.Chat
Hosting – Cloudflare
Analytics – Google Analytics
Payment – Stripe
These what I've found that Gather Town is probably using.
Is there anything else?
Checkout www.builtwith.com
I use it all the time to see how sites are built and what they’re using.
By the way, is there any website collecting public Gather Town Event for people to browse and join?