The Compliance Engine

Free, open-source visualization and animation tool for displaying simulation results from NIST Fire Dynamics Simulator (FDS) and CFAST models -- renders particle flow, gas temperature contours, smoke density, and flow vectors in 3D animations and 2D slices, enabling fire protection engineers to understand fire and smoke behavior; developed and maintained by NIST.

Free, open-source computational fluid dynamics (CFD) model of fire-driven fluid flow that solves the Navier-Stokes equations for low-speed, thermally-driven flow with emphasis on smoke and heat transport from fires -- used by fire protection engineers worldwide to model fire growth, smoke propagation, heat transfer, and sprinkler activation in buildings; developed and maintained by NIST.

Free, open-source fire modeling software that simulates fire growth, smoke transport, and temperature distribution throughout building compartments during a fire -- used by fire investigators, safety officials, engineers, and architects to predict how smoke, heat, and harmful gases move and change as a fire progresses; developed and maintained by NIST.

Pedestrian dynamics and evacuation simulation software that models 3D crowd movement, circulation, and emergency egress scenarios -- used by fire protection and life-safety engineers to validate egress code compliance, analyze occupant flow under fire conditions, and optimize emergency response; features adaptive agent-based modeling, automatic way-finding, occupant demographics, and scenario testing; developed by Oasys (part of Arup).