@coryetzkorn @DanielFreeman @Netlify @SlackHQ These don't use the comments example I shared (I only recently conjured that one up), but each of those sites is hosted on Netlify and uses a variety of the free and open source libraries created to help with some features.
https://www.netlify.com/open-source/
My tweets and posts live here on my own domain these days.
You can explore them here and follow me on Mastodon instead of Twitter where I'm not currently active.