What’s Your Favorite Open Source Project?

Hello gentle reader, I’m looking for your favorite open source projects; applications, websites, services. If the code is available for free and you’re a big fan, throw them in the comments.

    I’ll start:
    WordPress – weblog engine and content management system
    Ruby on Rails – web application framework
    CocoaMySQL – OS X desktop MySQL database manager
    Adium – Multi-protocol Instant Messaging client

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