Cappuccino is an open source framework that makes it easy to build desktop-caliber applications that run in a web browser. It is built on top of standard web technologies like JavaScript, and it implements most of the familiar APIs from GNUstep and Apple's Cocoa frameworks. Cappuccino is implemented using a new programming language called Objective-J, which is modelled after Objective-C and built entirely on top of JavaScript. Programs written in Objective-J are interpreted in the client, so no compilation or plugins are required.
Cappuccino and Objective-J are registered Trademarks of 280 North.
TLTagControl
This is a tag edit control built in Cappuccino. It features a nice rendering of tags, an autosuggest box that filters itself automatically as you type and inserts the selected tag upon hitting enter.
The control also supports drag and drop for reordering the list for instance. See the control in action.