Most useful free Java libraries?

Posted by Pyrolistical on Stack Overflow See other posts from Stack Overflow or by Pyrolistical
Published on 2008-09-24T21:29:01Z Indexed on 2010/03/17 12:01 UTC
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I've never seen a good list of free Java libraries.

What are some of your can't-live-without Java libraries?

Note: to keep this poll as useful as possible, please remember:

Post only one library per answer
We don't want duplicate answers, so before posting check if the library has been mentioned already
When adding a new library, provide a short summary of what it does / why you think it's useful

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