One of my scientific projects, LoadRunner automates the calculation of dissolved river loads, based on public US Geographical Society river flow and water quality sample data. This is a user interface level to automate running LOADEST over whole watersheds. LoadRunner is used to research ocean carbon sequestration, among other things. Runs on Windows and Mac OSX.
Woods simulates northeastern U.S. forest growth with 3 tree species. Features disruptions (hurricanes, deer grazing, fires, etc.), landscape fragmentation, and mixed site quality. Based loosely on Sortie. Woods is primarily a teaching simulator, used at several universities. At Yale, it's used to teach Landscape Ecology.
GrassWorld models a 3-level grassland food chain: plant, grasshopper, and grasshopper-hunting spiders. Optional competing plant species. Research simulator.
A GrassWorld Lab for advanced high school ecology students, written by Amy L. Sheck, Instructor of Biology, NCSSM, North Carolina. This activity has been student-tested and enjoyed. Thank you for sharing, Amy!