ParPre a parallel preconditioners package. ParPre is a library of parallel preconditioners for iterative solution methods for linear systems of equations. It includes classical point/block relaxation methods, generalised block SSOR preconditioners (this includes ILU), and domain decomposition methods (additive and multiplicative Schwarz, Schur complement). The communication protocol is MPI, and low level routines from the Petsc library are used.