  We introduce an open-source software Aamks for fire risk assessment. This
article focuses on a component of Aamks - an evacuation simulator named a-evac.
A-evac models evacuation of humans in the fire environment produced by CFAST
fire simulator. In the article we discuss the probabilistic evacuation
approach, automatic planning of exit routes, the interactions amongst the
moving evacuees and the impact of smoke on the humans. The results consist of
risk values based on FED, F-N curves and evacuation animations.
