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There are several freely available packages for the iterative solution of linear systems of equations, typically derived from partial differential equation problems. In this report I will give a brief description of a number of packages, and give an inventory of their features and defining characteristics.

The most important features of the packages are which iterative methods and preconditioners supply; the most relevant defining characteristics are the interface they present to the user's data structures, and their implementation language.

Victor Eijkhout
Mon Aug 25 17:46:10 PDT 1997