dhtmlxTree represents hierarchically organized data in the best way and allows you to create user-friendly navigation system. This JavaScript Tree Menu can load its content dynamicaly from server using Ajax or directly from on-page XML data-island. The tree has cross-browser compatibility, powerful JavaScript API, drag-n-drop functionality, built-in checkboxes and context menu. There are CF and JSP tags and ASP.NET custom control for the tree.

Page Popup Maker
Page Popup Maker generates all the code needed to create several types of pop up windows. No programming skills necessary. Create a wide variety of popups, such as page load, page close, link, form button, mouse over or even image link.

dhtmlxMenu
dhtmlxMenu is a customizable JavaScript menu with high functionality, XML support, cross-browser compatibility and rich API. You can freely define visual menu appearance and complexity by simply changing menu parameters. Free for non-commercial use.

.NET Barcode Component - NBarcode
NBarcode for .NET are C# and VB.NET components for Barcode Reading and Writing. It suports Windows Forms, ASP.NET, WPF, SQL Server Reporting Services applications. It can generate and recognize more than 20 different barcode types (1D and 2D).

Apycom DHTML Menu
Apycom DHTML Menu is a ready-made, professional solution that allows webmasters to create superior, cross-browser, fast-loading web menus. Easy-to-setup, 24 visual effects, flat, 3d and XP styles, supports floating, drag-n-drop, separators, etc.

JS Auto Form Validator - JavaScript Easy-To-Setup
This is a very easy-to-setup form validation script. The main idea is: you heed to write NOTHING of JavaScript code to handle whole form validation process.