Gapminder is full of amazing interactive graphics demonstrating big global trends in poverty, health and other aspects of human development. Which countries are healthiest, wealthiest and most educated? Powered by Trendalyzer and Google Spreadsheet, this free learning tool can help you investigate the world's sustainability issues right from your computer.
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I'm sorry, but I don't think the Gapminder software (Trendalyzer) is open-source. Google bought the software from Gapminder, and has incorporated some of it into its product offerings (including the Visualization API), but so far as I know, has never open-sourced the software. I'd love to be proven wrong, though, it's neat software.