KDE for Developers
kde.org
kde.org
Pity that isn't as much loved as it should be.
http://ftp.math.utah.edu/pub/tex/bib/cccuj2000.html#Pinto:20...
I think Kate definitely need language servers support (or alternative support) before it can be competitive.
It looks already pretty awesome and feature packed (not even astrovim has multiple selections editing!)
Kate has LSP support for a few years already.
For example, AFAIR, Kate was integrated as text editor into KDevelop (which I painfully used as main IDE in linux), but it created unbelievable mess in settings - some of them didn't change, others changed things globally for KATE, some worked for KDev. Menus didn't stack up... But still, I really appreciate all the work was done by kdevs! One other IDE I would consider is Code::Blocks, but wx is not entirely good with Qt as backend yet.
XPC and Android Binder are also two other examples of better tooling in this area.
Edit: I'm a linux user, but I don't idolize it.