The library I hear the most about is jQuery. However there are a whole lot more. Developers sometimes think that ExtJS does not get enough press.
If you are not integrating it into a commercial product, you can get ExtJS for free. You add some lines of code to your header section to bring in the ExtJS functionality. Then you use the extension library framework.
Check Your Subroutines - We are delivering our latest release to internal test today. Had a code review yesterday. Many issues were found. We are fixing the highest priority probl...