Agent-based modeling

Packages and IDEs (Integrated Development Environments)

NetLogo - has its own interpreted object-oriented language.
1. Pros: free; platform-independent; probably the easiest IDE for agent-based modeling; easy to make a GUI (Graphical User Interface; e.g. add sliders for variables, add plots, and so on), built-in loops ("forever" checkbox on the Go button as well as the "ask" keyword).
2. Cons: not very powerful, fast, or flexible.
Repast - a library package for agent-based modeling designed to work with Java (platform-independent) or C# (Microsoft Windows only).