The Spatiotemporal Epidemiological Modeler (STEM) is free software available through the Eclipse Foundation.

By using a component software architecture, all of the components or elements required for a disease model, including the code and the data are available as software building blocks that can be independently exchanged, extended, reused, or replaced.

Both the nodes and the edges can be labeled or "decorated" with a variety of denominator data and models.

This graphical representation is implemented using the Eclipse Modeling Framework (EMF).

Predefined subgraphs defining different countries can be assembled with a drag and drop interface.