- Pixels to Ems and back http://pxtoem.com/
- Colour names from hexidecimal http://chir.ag/projects/name-that-color/
- Alternative Lorem http://www.boganipsum.com/
- More animated preloaders than you can shake an hourglass at http://preloaders.net/
- Grey box (or otherwise) placeholder images http://placehold.it/
- CSS3 gradient creator http://www.colorzilla.com/gradient-editor/
- CSS selector independent grid framework http://zengrids.com/
- Nnja CSS to styleguide/documentation library https://github.com/thomasdavis/kaleistyleguide
- Breakpoint mixins for SASS https://github.com/canarymason/breakpoint
- Pantone variables partial for SASS https://github.com/leemarkwood/sass_pantones
- Beautiful icons by Entypo CC BY-SA 3.0 http://www.entypo.com/
- Searchable type icon sets (including Entypo) from Fontello http://fontello.com/
- FInd all the colours in your CSS http://www.colorfyit.com
- Compatibility of web features at Can I Use? http://caniuse.com/
- Compressing PNG graphics
- As a service http://tinypng.org/
- As a command line tool http://pngquant.org/
WCAG2.0 tools (Accessibility)
- Colour contrast checker http://www.checkmycolours.com
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