ExtendSim is a simulation program for modeling discrete event, continuous, agent-based, discrete rate, and mixed-mode processes. There are three main ExtendSim simulation model building packages: CP for modeling continuous processes; DE which adds discrete event technology; and Pro which adds discrete rate and reliability block diagramming modules. ExtendSim Analysis RunTime is for model analysis and ExtendSim Cloud which provides access to models located on self-hosted servers for analysis by internal or external users.