mesoFON is an individual-based mangrove forest model. It is a Java implementation of the KiWi model done with RePast Simphony. It contains several new features: (1) You can add up to 10 species via the GUI. However, in principle, the number of species to be included programmatically is unlimited. (2) You can use a variety of growth functions via typing them in as a string on the GUI. (3) The model is transparent, sinc it comes with the Eclipse workbench of RePast.