Neovim 0.5 is awesome. It has native LSP support, Lua configuration support that it feels like true revolution over past versions.

But, getting into optimal setup in neovim/vim involves lot of configuration. Here is mine if you want to refer:

What's a good x-platform GUI for it?

1) Terminal

2) Neovide :

3) Neovim-Qt :

VimR [0] is a nice OSX GUI for Neovim.

FireNvim [1] is a browser plugin which embeds a Neovim editor window in HTML textareas