I am developing a JavaScript API and am looking for examples. Please indicate the libraries you like, one answer for each library. If you don't mind, a comment explaining why you think this is good would be helpful.
Also, please support existing answers if you agree that some library already published is good.
Update: I am looking for APIs that do their job well (although this job may be niche), which I enjoy using, include a good learning curve, have excellent documentation / test coverage, lead to simple client code for common cases or similar. I'm not necessarily looking for an API that does some incomprehensibly amazing things like Cappuccino or JS / UIX.
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