mx39 reference
I recently came across a new platform while browsing, and I was surprised by how smooth and fast the overall experience feels compared to others I've tried before, especially in terms of loading speed and usability
https://write.data.coop/a55svweb5p/55s-reference
http://write.tildeverse.org/k59ol6oj5/k59-reference
https://blog.mithril.re/f6zpgnmdo02/6zpg-reference