Alternatives are there to jQuery that work in the same or similar way

I'm looking for alternative JavaScript Libraries to learn as an alternative开发者_开发技巧 to jQuery, as I think it would be good to know more than one and so i can broaden what libraries I know.

I'd tried Mootools so far but am not sure what else is just as good.

Any ideas?

• Glow
• YUI
• Protype
• ExtJS
• Sproutcore
• Dojo

See:

Comparison of JavaScript frameworks

Another good resource:

Compare JavaScript frameworks

Some of the things compared include:

• Selectors
• DOM traversal
• DOM manipulation
• Utility functions
• Event handling
• Ajax

The "Functional" and "Underscore" libraries are interesting, and quite different in purpose than jQuery. Those two libraries don't have much to do with DOM manipullation at all — they're about functional programming, really.

• Functional: http://osteele.com/sources/javascript/functional/
• Underscore: http://documentcloud.github.com/underscore/

Underscore is designed to play nice with jQuery.

Not to forget Mootools: http://mootools.net/