The popularity of jQuery is because of its lightness, CSS support and cross-browser compatibility. Other than that you can find many free jQuery code which can be easily added in your website and easy to customize. Here are some free jQuery code by jQueryTools here you can find jQuery code, tutorial and graphic files for free, these tools will help you to give jQuery power to your website.
1. jQuery Tabs
2. jQuery Tooltip
Tooltip helps you to build easier user interfaces. Big or small. Pluggable effects. Yet another crucial tool.
3. jQuery Overlay
4. jQuery Scrollable
Scrollable is the most successful tool in this library. jQuery Scrollable gives your content a scrolling effect.
5. jQuery Form
FORM is a collection of essential form building tools. Validation, range- and date inputs for humans.