Ample Runtime is the core component of the Ample SDK framework. It enables the XML processing, DOM abstraction and UI services. The UI Language implementations run on the Ample Runtime.
The Ample Runtime also hosts implementations of XML "processing" technologies such as XInclude 1.0, XML Events 1.0, SMIL 3.0, XBL 2.0 etc. Learn more on Ample XML Technologies
The User Interface languages implemented in Ample SDK include such technologies as: XHTML 1.0, SVG 1.1, XUL 1.0, HTML 5.0 etc. Learn more on Ample UI Languages
There are several plugins included with Ample SDK such as Forms, Cookie, XSLT, Storage etc. Community provides other plugins too. Take a look at the overview of Plugins