Fisher Matrix analysis is a quick and robust way to predict how a given survey will help constrain parameters within an assumed model. It is used to compare different surveys, and to optimise an experiment for your science goals. Fisher4Cast is a modular, user-friendly package designed to produce Fisher Matrix ellipses for an arbitrary model and number of parameters. Publically released since May 2008.

Papers

Release paper and cosmological application
Users' Manual -- code is available for download here