City simulators are generally agent-based simulations with explicit representations for land use and transportation.
A special type of discrete simulation that does not rely on a model with an underlying equation, but can nonetheless be represented formally, is agent-based simulation.
More recently, Ron Sun developed methods for basing agent-based simulation on models of human cognition, known as cognitive social simulation.
JASSS is now the main forum for scientific publications in the field of agent-based social simulation.
Pythagoras offers a unique set of capabilities in the area of agent-based simulations:
The grid is useful to build agent-based simulations including cellular automata or diffusion-based models.
Experimental methods consist of laboratory experiments, numerical simulations, or agent-based simulations.
An original implementation was developed in Ascape, Java software suitable for agent-based social simulation.
Simio software for discrete event, continuous, and agent-based simulation.
ExtendSim simulation environment for discrete event, continuous, discrete-rate and agent-based simulation.