VimR is very good; I've been using it before it started using Neovim as the core [1].
I’ve been using VimR the longest, which is a Mac-native GUI for Neovim: https://github.com/qvacua/vimr
[1] https://github.com/neovim/neovim/wiki/Related-projects#gui [2] https://github.com/qvacua/vimr
FireNvim [1] is a browser plugin which embeds a Neovim editor window in HTML textareas
- Native mouse selection of text, proper copy/paste, ideally with a "narrow caret" instead of block cursor everywhere
- Native graphical file tree with drag and drop
- Native tabs with pretty drag and drop
- Pixel-fine resizing of panes
- Pixel-fine scrolling!!
[0]: Everywhere I say "native" above, I don't really care if it's GTK or electron (provided it's snappy) or whatever. I mean the nebulous feeling of having text areas work like every other text area on my desktop.
VimR (https://github.com/qvacua/vimr) on mac was the closest to this I ever got, and I love that editor, but I'm not on macOS anymore.
edit: Oh g-----, I'm literally describing aquamacs. I wonder if anyone has tried to run it on linux with GNUstep or something ;__;