I am searching a Plugin for autocompletion which does not have any requirements to lua ruby or python. I would love to use YouCompleteMe but it requires python, which is not availiable on my server. At all vim there does not have lua, python or ruby support, which makes it really hard to find anything. Maybe there is something written in Go like for example fzf, which could be easily added to vim without sudo permission. 
Autocompletion Plugin for VIM without external requirements
autocompletion
Try vim-complete https://github.com/lifepillar/vim-mucomplete. It is a minimalistic autocompletion plugin, written in VimL.  