I work with Atom editor (from GitHub). For me, it is the best editor ever. I tried many others before, but only with Atom I feel at home ;). Atom has great css & js linters. atom.io

It's kind of an old discussion, so I hope you don't mind me barging in. For most part, I use Atom and Vim. My main stream code is JavaScript (Node, really).

For Atom, the inbuilt linter interface does the job with the linter I want: ESLint. My configuration (.eslintrc) is inspired by the awesome people at AirBnb.

For Vim, the fan/syntastic plugin's perfect. It comes with every possible linter you'll ever want.

I work mostly with Sublime.

When I want to lint a language I simply google for "sublime css lint" and often find the right tool.

For example: github.com/SublimeLinter/SublimeLinter-csslint

The package for sublime with a detailed instruction on how to install the linter. And yes, this is the css linter I use.

IntelliJ does that automatically for me, so no need for external linters.