Long time user of (and contributor to) Docusaurus. I use it to build my markdown powered tech blog. https://johnnyreilly.com/ It is very much a Goldilocks product for me ("just right") in that it has React support, Markdown support, TypeScript support and a good amount of customisation is possible (good underlying APIs). It also has a great community. Props to Sébastien Lorber for leading the project so well!
Hey John, thanks for your contributions! Also gotta give a big shoutout to Sébastien and the crew for creating and constantly updating Docusaurus - it's one of my favorite docs software.