DeltaTick Modeling Toolkit
The Modeling Toolkit component of DeltaTick will enable users to build their own NetLogo agent-based models by defining the features and behaviors of agents in a system of interest per "tick" of time (or time differential). The toolkit will then reveal to users how the per-tick behaviors they assign to agents change those agents' measures of interest (for example, if predators and their prey are included in a DeltaTick system and predators eat prey only if they are spatially near, then predators' and prey's motion rules will affect population levels). Finally, the toolkit will produce a complete NetLogo model based on user input, so that they can observe how their per-tick rules integrate over time to produce the mathematical patterns traditionally used to describe such systems.

NetLogo HotLink Replay (part of the DeltaTick project)
NetLogo HotLink Replay enables NetLogo users to save any NetLogo model run and then investigate the model's behavior at any point during that run by either moving forward and back through the images generated by the model, or by clicking on specific features of the model's generated graphs (for example, interesting maxima, minima, or inflection points in the graph) to see the model's view at the time that graph feature was generated.

NetLogo's HotLink Replay is intended to help students see the links between the behavior of computational models of scientific systems, and the mathematical patterns that are traditionally used to describe those systems.

NetLogo Models and Model Suites
IFS Fractal Construction Toolkits
Enables users to create their own fractals by creating and manipulating squares to define the functions of an Iterated Function System. To be featured in Mike Eisenberg's Computational Diversions column, in the International Journal of Computers for Mathematical Learning.


The Chaos Suite
Simple visualizations of many popular chaotic dynamical systems.



Exploring Coombs Unfolding
An example of how agent-based computational approaches can introduce new solutions to old mathematical problems. See Wilkerson, M. (In Press). Agents with attitude: Exploring coombs unfolding. International Journal of Computers for Mathematical Learning.


Others
GasLab 3D Suite
Surface Walking Algorithms

Ubiquitous Presenter (at UCSD)
Before joining Northwestern, I worked on the UCSD Ubiquitous Presenter project, which added synchronous and asynchronous web-based features to the popular University of Washington Tablet PC lecturing system, Classroom Presenter. See the Ubiquitous Presenter website at UCSD for more information.