NodeBox is an application used in graphic design research. It provides an interactive Python environment where you can create two-dimensional graphics. NodeBox scripts can create PDFs or QuickTime movies that can contain anything from simple geometrical shapes to fully-fledged bitmaps, vector images and text.
NodeBox is mostly meant to design and explore generative design and animation. It features several ways to manipulate parameters inside of a program: it contains an interface builder and an on-the-fly value changing gizmo called the throttle.
The NodeBox source is available on GitHub: