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One of my favorite CLI tools is Wallace. Once installed, type wallace and then the site name. The output shows everything you need to know about the CSS code for the site. My favorite things to look at are the number of times !important is used, as well as how many IDs are in the code. Another neat piece of information is the top specificity number and how many selectors use it. These might be red flags for "bad" code.
The csscss CLI tool shows which rules share the same declarations. This is useful for identifying duplicated code and opportunities to reduce the amount of code that's written. I would think twice before doing that as it might not be worthwhile, especially with today's caching mechanisms. It is worth mentioning that csscss requires Ruby.
Color Sorter — Sort CSS colors by hue, then by saturation.
CSS Analyzer — Generate an analysis for a string of CSS.
constyble — This is a CSS complexity linter, based on CSS Analyzer.
uCSS — Crawl websites to identify unused CSS.