Like a regular Windows Spin control, but is implemented entirely in JavaScript. [Commercial]

A read-eval-print loop for JavaScript that works in IE, Mozilla, and Opera. Includes a Mozilla bookmarklet to run shell commands in the context of any web page.

Script for converting your JavaScripts into difficult to read JavaScripts

JavaScript to display photo albums with many customizable options.

Library of objects and functions, to display and dynamically modify coordinate diagrams and charts in webpages. [Freeware]

Excalent example using JavaScript for page animation.

Add javascript Popups Announcements to website. Popup content can be easily changed by the website owner - from the Popup itself. Requires registration (Free) and easy install code.

A Javascript-based form validation script supporting advanced features. [Open source, LGPL]

Zapatec Javascript Menu is a search engine friendly cross browser compatible menu. Zapatec Javascript Calendar is a cross browser compatible calendar. Zapatec Javascript Tree is a cross browser search engine friendly way to display information.

Proposes JavaScript/DHTML controls to extend existing HTML control set including ComboBox, SpreadSheet, Spin, Scrambler. [Commercial]