What is "extendsim"

ExtendSim (formerly known as Extend) is a simulation program for modeling discrete event, continuous, agent-based, and discrete rate processes. There are four ExtendSim packages: CP for continuous processes; OR (operations research) which adds discrete event; AT (advanced technology) which adds discrete rate, a number of advanced modeling features, and Stat::Fit for statistical distribution fitting; and Suite which adds 3D animation.