Artbreeder - Create beautiful, wild and weird images
AnyLogic - AnyLogic has changed simulation modeling and expanded its application into complex business environments. The unmatched flexibility of multimethod modeling allows users to capture the complexity of virtually any system, at any level of detail.
Codenail - Create art with your code and logo and order a poster of it
Simulation of Urban MObility (SUMO) - "Simulation of Urban MObility" (SUMO) is an open source, highly portable, microscopic and continuous road traffic simulation package designed to handle large road networks. SUMO is licensed under the Eclipse Public License V2.
No Paint - A game to create your very own art masterpiece
MATSim - MATSim is an open-source framework for implementing large-scale agent-based transport simulations.