From Moviesandbox

What is Moviesandbox

MovieSandbox is a graphical scripting tool that enables users to script their own gameplay elements. The original idea behind Moviesandbox was a graphical Machinima[1] toolkit. Though, Moviesandbox does not use a Timeline, but allows you to link different elements together in a Hypergraph-like fashion.

MovieSandbox's goal is to be simple to use and does not require any additional software to create content, meaning you can draw directly into your scene, create skeletons and characters and animate them directly from within. Also, Moviesandbox is Open-Source, meaning that you can add and change things around following the Code Guidelines.

MovieSandbox is cross-platform. It is designed to work for Linux, Mac and PC.

Though originally intended as a movie creation tool, MovieSandbox can also be used to script live performances and interactive sequences using either the Keyboard or data received by its UDP interface.