MochiKit is a highly documented and well tested, suite of JavaScript libraries. To turn off MochiKit’s export feature (which may be necessary for compatibility with some existing code), do this before loading MochiKit: <script type="text/javascript">MochiKit = {__export__: false};</script> ...

AJS is a ultra lightweight JavaScript library that is around 2 years old. It is inspired by MochiKit, but differs by being small and expressive. The current version is only 33 KB (uncompressed!), whereas MochiKit and other libraries such as JQuery, Mootools or Prototype is over/around 100 KB. AJS includes: ...