A simple particle system physics engine for processing. I've designed this to be application / domain agnostic. All this is supposed to do is let you make particles, apply forces and calculate the positions of particles over time in real-time. Anything else you need to handle yourself.
M. Goedicke, T. Meyer, and G. Taentzer. Proc. Int'l Workshop on Theory and Application of Graph Transformation (TAGT), volume 1764 of Lecture Notes in Computer Science, Springer-Verlag, (2000)
K. Sugiyama. Series on software engineering and knowledge engineering ; 11 World Scientific, Singapore u.a., (2002)Kozo Sugiyama. Literaturverz. S. 203 - 212. $5GBV.