SVG masks. This is a very interesting technology. It allows us to create a lot of cool effects, even in IE. I created an example for one of my answers on toster.ru. It looks nice and it has been picked on CodePen recently, so I think I should share it here too.
See the Pen SVG mask example by Ivan Bogachev (@sfi0zy) on CodePen.
Simple UI framework. RSCSS, REM-based sizes, fluid typography and other nice ideas. This website is powered by it.
Unique avatars for your users. No dependencies, VanillaJS, 1.6KB gzipped.
Dark color scheme for Vim. Mostly blue and green colors.