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InfluxDB
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I'm not quite sure where the "stable" comment comes from as Vim, NeoVim, and MacVim are all stable projects with active development. MacVim is a macOS GUI for Vim, so the equivalent is VimR for NeoVim (which doesn't maintain official GUI implementations). Otherwise both Vim and NeoVim work natively on macOS as terminal apps.
You can read up on MacVim's docs though no here: https://github.com/macvim-dev/macvim/blob/master/runtime/doc/gui_mac.txt. Features MacVim support include being bundled as a Mac app, can bind menu items to TouchBar, supports touch pad gestures, drag-and-drop, full-screen support, can launch using a mvim:// protocol (e.g. in iTerm2 you can tell it to launch MacVim when you click on a file path), etc.
This project was before my time as it's more than a decade old (original page) and the project switched maintainer a few times already (I only became maintainer in 2018). But the basic story is Vim never really got a good gVim implementation for Mac. There was an old implementation for Carbon (now-deprecated API) in Vim but it was quite barebones, and hasn't been working for a while (just for reference you can see this thread which discussed removing the vestigial Carbon-based gVim implementation from the Vim source). Because of that, there were quite a few Vim forks that aimed to bring gVim to the Mac (MacOS 9, Mac OSX Carbon, macOS Cocoa). You can see a decent list of choices in this archived Vim download page. However, most of them were for older versions of macOS, and the closest one to MacVim, vim-cocoa, has not been updated for a while, meaning MacVim is the only actively-maintained gVim implementation for Vim now (not counting NeoVim).
Yeah that's mostly correct. MacVim isn't based on NeoVim though and is a fork of Vim. But you are right I didn't realize there are actually more NeoVim GUI implementations that I thought on macOS! (https://github.com/neovim/neovim/wiki/Related-projects) I think there are probably 2-3 active macOS ones that I could see, including Electron-based implementations. I do think with these things usually projects consolidate because unless you are bringing something completely new to the table, eventually it just saves time to only have a couple active projects which is why a lot of the projects there are abandoned.