OPEN SOURCE:
http://www.stuffbydavid.com/apps/dnd-to-gml-converter
This tool can translate any number of Drag and Drop actions into GML in one click! Just drag the wished DnD icon to the action field, answer some simple questions and press "Get GML" to translate it to pure Game Maker Language! This tool is very useful if you're learning GML or even for professional programmers sometimes.
Version 2 includes the ability to add unlimited number of actions, automatic code indenting and much more!