C# has an official language server and an unofficial one (that unfortunately seems less maintained now). It works just fine with neovim.
Funny enough, it's the efforts of Omnisharp and the VSCode team that has so significantly improved the experience of using various other languages in open source editors due to the creation of LSP.
Funny enough, it's the efforts of Omnisharp and the VSCode team that has so significantly improved the experience of using various other languages in open source editors due to the creation of LSP.