Based on the Market and Price simulation model in System Zoo 3, Z504. I made some more intrusive changes that make the model more realistic, or more 'economic', in another version 'simplified and improved'. 

Z204 from System Zoo 1 p91-94

System Zoo Z418 - Sustainable Use of a renewable resource from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources

Presents the Z107 infection dynamics model from the Elementary Systems series in System Zoo 1.  Adapted from Hartmut Bossel's "System Zoo 1 Simulation Models, Elementary Systems, Physics, Engineering".

Bipolar II treatment modeling using Van der Pol-like oscillators.

In this simulation an afflicted individual with Bipolar II disorder is put to treatment after 20 months the calibration of the medicine or treatment he recieves is such that it simulates the natural cycles of a "normal being". You can note by manipulating the parameters that sometimes too much treatment disrupts equilibria. Also note that in the state diagrams there are 2 limit cycles, the lower one being the healthiest as there are less changes.

System Zoo Z112: Double integration and exponential decay from System Zoo 1 by Hartmut Bossel

Z212 from System Zoo 1 p142-148

​System Zoo Z412 Tourism Dynamics from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources

Z206 from Hartmut Bossel System Zoo 1 p99-102 See also a beautiful Youtube 3D Video Simulation

Thanks to
https://insightmaker.com/insight/1830/Rossler-Chaotic-Attractor
for this example of chaos, and the transition to chaos. "After running the default settings Bossel describes A=0.2, B=0.2, Initial Values X=0 Y=2 and Z=0 and varying C=2,3,4,5 shows period doubling and transition to chaotic behavior."

We're looking into environmental applications in our course, and how dramatically dynamics can change, based on a small change in parameters. Climate change "suffers" this chaotic behavior, we fear, and we're going to be "taken by surprise" when the dynamics changes on us suddenly....

Andy Long

Z414 from System Zoo 2

Z206 from Hartmut Bossel System Zoo 1 p99-102 See also a beautiful Youtube 3D Video Simulation

Systems Zoo model Z305 Carbon balance of forests (Bossel, 2007). This implementation does not include human use of fuelwood and timber.

System Zoo Z110: Logistic growth with stock-dependent harvest from System Zoo 1 by Hartmut Bossel

System Zoo Z104: Exponential delay from System Zoo 1 by Hartmut Bossel

System Zoo Z107: Infection dynamics from System Zoo 1 by Hartmut Bossel

Insight Maker model based on the Z415 System Zoo model originally developed in Vensim.

System Zoo Z105: Time-dependent growth from System Zoo 1 by Hartmut Bossel

This models the progressive decline of the ability for self-reliance and the growing dependence on outside help. ​Z508 p39-42 System Zoo 3 by Hartmut Bossel. Strong outside help causes a collapse of self-help capacity. Weak outside help produces a stable combination of wellbeing and self-help capacity.

System Zoo Z111: Density-dependent growth (Michaelis-Menten) from System Zoo 1 by Hartmut Bossel

System Zoo Z108: Overloading a buffer from System Zoo 1 by Hartmut Bossel