1. CSS Minify

    CSS Minify

  2. Topcoat

    Topcoat

  3. Code Beautifier

    Code Beautifier: CSS Formatter and Optimiser

  4. CSS Nano

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  5. Dirty Markup

    DirtyMarkup Formatter - HTML, CSS, & JavaScript Beautifier

  6. Dust-Me Selectors

    [brothercake] Dust-Me Selectors

  7. CSS Lint

    CSS Lint

  8. CSS Validation Service

    The W3C CSS Validation Service