artempyanykh/marksman: Write Markdown with code assist and intelligence in the comfort of your favourite editor.
An LSP server for Markdown.
From Zero To IDE with Emacs and LSP
Handy guide to getting going with lots of LSP goodness in Emacs.
Lem
A programmer's editor written in Common Lisp, written for Common Lisp, which aims to be a good Common Lisp IDE; but which also works as an IDE for other languages too.
Think Emacs in Common Lisp.