DynaSys
An easy-to-use dynamical systems modeler with great visualizations.
Just type in your difference equations, parameters, and variables and watch your dynamical system evolve. Examine a single path or an entire vector field. Change parameters and watch the effects in real time. Load and save models and data. Enter nullclines and Jacobians identification and classification of equilibria. Auto-generate fast C implementations of your model and fit them to data using Matlab, with optional GPU support.
The long-term goal is to incorporate this into software...