Solarized by Ethan Schoonover

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Solarized is a sixteen color palette (eight monotones, eight accent colors) designed for use with terminal and gui applications

IcoMoon

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IcoMoon provides a package of vector icons, along with a free HTML5 app for making custom icon fonts. Browse among thousands of pixel perfect icons or import your own vectors.

Nadarei KSS

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Nadarei KSS Styleguides lets you create pretty styleguides for your Rails 3.2 projects.

CSS Spinners

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15 simple CSS spinners and throbbers made with CSS and minimal HTML markup.

DOM Monster Bookmarklet

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DOM Monster is a cross-platform, cross-browser bookmarklet that will analyze the DOM & other features of the page you're on, and give you its bill of health.