way to share their code and to search for others shared code. VORTEX. VORTEX is an individual-based simulation software that incorporates deterministic forces as well as demographic, environmental and genetic stochastic events on wildlife populations. RAMAS. Widely accepted software packages for PVA with options for age/stage structure, spatial processes, and landscape change. Models can be built and run using a graphic user interface or users can incorporate the program's batch mode into automated workflows. Ecology Mathematical and theoretical biology Biostatistics