tali-gml provides a lexer, parser, and interpreter for the Tali programming language in GameMaker.
GameMaker is a surprisingly versatile and powerful application development tool. Unfortunately, the platform's built-in scripting language (GameMaker Language, or GML) leaves a lot to be desired - particularly the verbosity of its standard library. And those scoping rules... heavens above.
If you'd rather write Lisp than GML, then tali-gml is the project for you!