dhtmlxTreeGrid is Ajax-powered JavaScript UI component that combines tree view and editable table. Being written entirely in JavaScript the treegrid runs on client-side and allows manipulating and editing tree/table data on the fly.
Tigra Color Picker is free cross-browser JavaScript widget that makes it easy for your visitors to fill out color value field(s) by selecting the color from a popup palette.
[Version: 1.0]
[Cost: Freeware] [Platforms: Windows (95; 98/se; ME; 2000;]
DHTML component written in pure JavaScript to display and edit data in table, grid, tree or grid with tree. Compatible with the most of standard browsers. Very small code (50kB). All operations performed on client side. ASP.NET support code available.
Tigra Form Validator is free JavaScript component performing client side form validation. With its rich feature set the script can be used with HTML forms of virtually any complexity.
[Version: 1.2]
[Cost: Free] [Platforms: Windows 95/98/ME/2000/XP; Mac]
If you have a "Today's Date" field in your form, why not let JavaScript automatically fill it in for your visitors? Easily configurable to show the date in desired order of month, day, and year.