The Core module is not tied to any scripting language - it depends only on PicoContainer and the JDK itself. It does provide support for XML.
The BeanShell module provides support for BeanShell scripting.
The Script Groovy module provides support for Script Groovy scripting.
The Script JRuby module provides support for Script Script JRuby scripting.
The Script Jython module provides support for Jython scripting.
The Script Rhino module provides support for Rhino scripting.