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Epigrass is a open-source simulation platform created to study epidemics and their spatial (geographic) dinamics.

Epigrass was developed as a scientific project, by the founders of Metamodellers at the Oswaldo Cruz Foundation. Currently, Metamodellers is the main maintainer of the code, ensuring its continuous improvement while remaining a completely free tool.

In Epigrass, space is represented as a network of interconnected localities. Therefore, the concepts of nodes and edges, from mathematical graph theory is used to analyze the properties of the spatio-temporal dynamics of models constructed in Epigrass. The spread of a transmissible disease, for example, becomes a tree-shaped subgraph of the complete spatial graph.

Models in Epigrass can be quickly specified through a small set of text files editable on any standard tex editor. But Epigrass also offers GUI-based model editing tools to help with model definition.

Since space in Epigrass is real geographic space, Epigrass can Import maps in shapefile format which are then used in the models. But usage of such maps is not obligatory as Epigrass also allows the definition of models based on non-georreferenced networks.

However, when maps are provided, the results are generated in shapefile and KML format, which can then be openned and visualized on any GIS tool including Google Earth and Google Maps.