8 great sites for one-stop data visualization

These are places to find, analyze and visualize publicly available data to use in your own materials.
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Find and visualize data from external sources

"Data visualization tool" usually means a platform to analyze your own data. But sometimes a one-stop shop can be useful: A place to find, slice and visualize data from elsewhere to add to your own projects.

What follows are some of the most useful websites for official or vetted data and accompanying tools to visualize them. All of these sites, except for the last two -- WeatherSpark and DataMarket -- provide data and tools for free.

(Note: If you're looking for ways to visualize your own data, head to 22 free tools for data visualization and analysis and the accompanying chart of free data tools.)

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