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ForTrilinos provides a set of standards-conforming, portable Fortran interfaces to Trilinos packages. ForTrilinos is intended to be minimal in its implementation. Relative to direct interaction with Trilinos from C++, calling Trilinos from Fortran via ForTrilinos adds no overhead beyond that associated with a single additional function call. The development of ForTrilinos is primarily user-driven, so new interfaces are developed at the request of Trilinos users.