Designed with multigrid methods in mind, hypre is a package that provides many high performance preconditioners. It provides another option in scalable software for solving large, sparse linear systems of equations on massively parallel computers. hypre has an interface for structured-grid based systems, semi-structured-grid based systems, finite element systems, and linear-algebraic systems. This paper tests the scalability of the structured-grid system interface.
Like PETSc, Hypre has the more popular Krylov Subspace Methods built-in. These include GMRES and Conjugate Gradient. Additionally, a multigrid method is available as a solver and a preconditioner. Other preconditioners available include Jacobi, diagonal scaling, BoomerAMG (hypre's algabraic multigrid), and ParaSAILS (hypre's sparse approximate inverse).