MotionCAPTCHA is a jQuery CAPTCHA plugin, based on the HTML5 Canvas Harmony procedural drawing tool by Mr Doob and the $1 Unistroke Gesture Regonizer algorithm (and the more recent Protractor algorithm improvement), requiring users to sketch the shape they see in the canvas in order to submit a form.
Lightbox is a simple, unobtrusive script used to overlay images on the current page. It’s a snap to setup and works on all modern browsers.
Digitarald SimpleTabs is a small, simple and unobtrusive Tab plugin for MooTools including support for Ajax content. Overlays semantic XHTML markup with a tabbed interface without additional changes. Customise the style and behaviour by changing the simplified CSS or via various custom Events.