tk10 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
http://write.tildeverse.org/f999u6cmix/f999-reference
https://people.kernel.org/b8999bet81kqsy/8999bet-reference
https://blog.mithril.re/k558hald0b1/558h-reference