hphp 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://blog.ombreport.info/w999gfez1bz/999g-reference
https://write.data.coop/h87a243rrr/87a-reference
http://write.tildeverse.org/b62t60rbqg/62t-reference