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This article is going to start pretty small... but feel free to add any cool programming-help-related sites.
- Quickly see which CSS declarations are supported by which browsers. Appears to be kept up to date with the latest browsers.
- Validates and prettily-formats JSON.
- NASA's Color Usage Site
- Detailed information on using colours to convey information
- Python Module of the Week
- A collection of brief instructional descriptions of various python modules. Handy for expanding your repertoire or finding facile examples.