FlexSim is described as 'is simulation software that models, simulates, predicts, and visualizes systems in manufacturing, material handling, healthcare, warehousing, mining, logistics, etc' and is an app in the Sport & Health category. There are six alternatives to FlexSim for Windows, Linux, Mac and Raspberry Pi. The best alternative is Anylogic. It's not free, so if you're looking for a free alternative, you could try JaamSim. Other great apps like FlexSim are Simio (Paid), SIMUL8 (Paid), WITNESS (Paid) and Simile (Paid).
AnyLogic is a cross-platform multimethod simulation modeling tool developed by The AnyLogic Company (former XJ Technologies). It supports agent-based, discrete event, and system dynamics simulation methodologies.
JaamSim is a java-based free and open source discrete-event simulation software which runs on Windows, Linux, and Mac OSX and includes a drag-and-drop user interface, interactive 3D graphics, input and output processing, and model development tools and editors
WITNESS is an established dynamic process simulation tool used by thousands of organisations to validate a proposed facility or business process, to achieve a desired process performance metric or to support continuous process improvement activities.
Multi-paradigm modelling and simulation software for complex dynamic systems in the earth, environmental and life sciences. Logic-based declarative modelling represents the interactions in these systems in a clearly structured, intuitive way.