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An interest plugin I've found recently (Neovim only) is Deoplete, which is basically Ctrl-n on steroids. As you type, it shows a list of completions without any kind of slowdown (on my 4 yo MBA). For some languages, such as TypeScript, it even shows type definitions. It's close to being on-par with the smart completion in IntelliJ.

https://github.com/Shougo/deoplete.nvim

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There's a bunch of plugins like that, here's a couple of the most popular ones:

- https://github.com/prabirshrestha/asyncomplete.vim

- https://github.com/lifepillar/vim-mucomplete

- https://github.com/roxma/nvim-completion-manager

- https://github.com/Valloric/YouCompleteMe

You missed https://github.com/maralla/completor.vim - one of the first async ones targeting vim8, later gaining neovim support. It doesn't look like it's easily extensible though, aside from using omnicompletion, which negates the async benefits.

Note that mucomplete isn't async, it's intended to be simple.

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