There are a number of projects in active development at the moment:
Visualizer -- the Visualizer takes in a syntax graph and puts out a list of GraphicalElements that represent the syntax graph
Display -- the Display paints the GraphicalElements in a window, and gathers gestures input by the user
Modifier -- the Modifier takes the gestures from the Display and turns them into modifications to the syntax graph
Re-writer -- takes the original syntax graph and re-writes all the custom elements into primitives
If you're new to the project, or thinking about joining, here are some things to get you started:
Project.. setting up tools (SVN).. etc
Notes on the code base (coming soon)
Style guides (coming soon)