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ReCAPTCHA is especially brutal if you aren't logged in to Google and are using Firefox. They make you do challenge after challenge after challenge and s-l-o-w-l-y fade in pictures as extra punishment. I've stopped using some sites because of it.

For people using neovim, I've been impressed by this completion engine:

https://github.com/neoclide/coc.nvim

It uses Language Server Protocol and goes quite deep pulling completions, and can, eg, render function documentation into floating windows (not yet merged into neovim)