 Portable, Extensible Toolkit for Scientific Computation

The Portable, Extensible Toolkit for Scientific Computation (PETSc) is an open-source framework designed for the development and solution of scientific applications. It is particularly focused on the numerical solution of large-scale problems that arise in scientific and engineering applications. PETSc provides a collection of data structures and routines for the scalable (parallel) solution of linear and nonlinear equations, including support for various numerical methods and algorithms.