The FloPy package is a community project that is being developed by volunteers. It consists of a set of scripts to run MODFLOW, MT3DMS, SEAWAT, SWI, PHT3D, and other MODFLOW-related groundwater programs. The package is written in Python, a powerful scripting language that is free, easy to learn, and rapidly becoming popular among hydrologists. Input scripts are confined to a single, readable file, which makes it easy to build, run, compare, reproduce, and archive models. FloPy is functional for most MODFLOW Packages, but it is still under development. Those interested in FloPy can download the code or binary installer for PC or Mac from flopy.googlecode.com.