1-st Pop-Up Menu Builder allows you to create a customized menu which pops up when pressing the right mouse button on a Web page. The customized menu can be applied to a whole page or to specific elements on the page. A wide variety of actions can be set to the items in the menu.
CookiePie is a Firefox extension enabling you to maintain different cookies storage in different tabs and windows. You can open multiple Gmail/Yahoo Mail accounts in different tabs and windows simultaneously. Developers can use CookiePie to test their Web software with different application users without the need to open different browsers.
Dojo is a cross-browser AJAX/DHTML toolkit for building dynamic Web UIs. Dojo includes a rich-text editing component, an aspect-oriented event system, rich drag-and-drop support, a rapid-prototyping framework for building new widgets, and a full-featured abstraction for XmlHTTP I/O. In short, it's a very fast way to build Web interfaces.