> http://www.vim.org/scripts/script.php?script_id=2937

This one doesn't need gVim, with rgb() and rgba() support https://github.com/ap/vim-css-color

For Python, there is a choice of the jedi library or the rope library to do refactoring and smart completion. This in addition to ctags and the like. I imagine other languages have similar things.

Jedi is pretty good actually. Initially it would sometimes be slow and mess up buffers, but that didn't happen for a long time.

Smart completion is fine to me, but the refactoring is a potential problems. It seems there isn't an open source refactoring tools as good as PyCharm for python.

Is there a nice sublime plugin for this perhaps? A very excellent idea.

LiveCSS.

Thanks for the CSS script link!

I would suggest using the https://github.com/ap/vim-css-color instead.