The Next Scripting Framework is a c-implemented Tcl extension for developing object oriented language flavors, such as e.g. domain specific languages. NSF is used as the basis of [XOTcl] 2 and nx [next-scripting]. NSF is tested with Tcl 8.5 and Tcl 8.6. For details, see http://next-scripting.org <>Object Orientation | next-scripting