PETSc, pronounced PET-see (the S is silent), is a suite of data structures and routines for the scalable (parallel) solution of scientific applications modeled by partial differential equations.  It employs the MPI standard for parallelism.

• Scientific applications that use PETSc
• Features of the PETSc libraries (and a recent podcast)
• Linear system solvers accessible from PETSc
• Related packages that use PETSc
  • TAO - Toolkit for Advanced Optimization.
  • SLEPc - Scalable Library for Eigenvalue Problems.
  • Prometheus - scalable unstructured finite element solver.
  • freeCFD - general purpose CFD solver.
  • OpenFVM - finite volume based CFD solver.
  • OOFEM - object oriented finite element library.
  • libMesh - adaptive finite element library.
  • DEAL.II - sophisticated C++ based finite element simulation package.
  • Python Bindings
    
    • petsc4py from Lisandro Dalcin at CIMEC
    • Elefant from the SML group at NICTA
• Packages that PETSc can optionally use
• PETSc is part of the DOE SciDAC TOPS project in algorithms, software, and applications for the scalable solution of PDES.