A great collection of CSS transition & animations. It’s still a work in progress, so it still growing/evolving. Chris Coyier has recored a [great introduction](http://css-tricks.com/video-screencasts/128-effeckt-css-local-setup-with-grunt-and-contributing-on-github/) of it, if you want to contribute.
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Emmet Cheat Sheet
Great overview of how to use the syntax of Emmet. A good way to speed up front-end development.
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Zenpen – a minimal web app for writing
> A minimalist writing zone, where you can block out all distractions and get to what’s important. The writing!
Zenpen looks like something I had in mind to build a few months back, but never did. An easy to use web app for writing. Not to cluttered, just a easy way to write. Best part, it’s [open source](https://github.com/tholman/zenpen) so you can improve on it.
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Pears
Dan Cederholm:
Collect, test, and experiment with interface pattern pairings of CSS & HTML. Pears is an open source WordPress theme, enabling people like you to get your own pattern library up and running quickly.
Brilliant.