TinyEditor is a simple JavaScript WYSIWYG editor that is both lightweight (8KB) and standalone. It can easily be customized to integrate with any website through CSS and the multitude of parameters.
This lightweight slideshow script supports any content and gracefully degrades without JavaScript support. It supports automatic rotation with the option to auto-resume, an active class on a navigation list if applicable, and a direction toggle (vertical or horizontal).
The third iteration of the TinyTable table sorting script adds search, column averages and totals, record numbering, a view all function, and a reset function. At only 6KB it is still lightweight, quick, and includes all previous features.
TinyScroller is a basic scrollable div script at only 1.7KB. It can be used with any HTML and degrades gracefully. The styling is completely customizable through the simple CSS.
amCharts if a full-featured Flash based charting library with a powerful JavaScript API.