include
Ajax dynamic content
Free Ajax load content script from DHTMLGoodies.com
purple-include
purple-include is a client-side JavaScript library that allows you to do client-side transclusions.
Sprinkle "Include" Javascript
This is basically CSI (Client-Side Includes), when SSI (Server-Side Includes) is not available. You can also call it "sprinkle", as that's the name I gave the Javascript library.
HInclude
Hinclude adds one element to HTML; hx:include. When the browser encounters this element, it will include the document at the end of the src attribute.