CreateJS is a framework that uses several libraries for a more fully-featured, pre-packaged app building experience. This is probably a good thing if you come from an ActionScript/Flash environment as it will be somewhat familiar.
Greensock TweenMax specifically competes with a section of CreateJS's framework, namely TweenJS, and targets post-Flash developers in a similar. TweenMax does offer a useful amount of features and is actually quite fast, though I've only tooled around with it briefly.
Jquery is a library for DOM manipulation/event handling/ simple animation (think, ease in a box, animate on mouseover, etc)/ AJAX. Jquery is incredibly popular and exists on over 50% of websites. However, this solution isn't specifically focused on making animation-heavy applications like games, etc. For smoothing over cross-browser issues and adding some power and fluidity to common actions (DOM/AJAX/events), it's hard to beat.