(Access Analytics acquired BCSLIB-EXT in 2007) BCSLIB-EXT is a mathematical software library, provided by Boeing Computer Services, which is designed to provide high-powered mathematical software to solve advanced problems. BCSLIB-EXT is well-documented, technically current, and easy-to-use. The software has been proven to be both efficient and highly robust in industrial applications. The second release of BCSLIB-EXT contains software for: solution of large sparse systems of linear equations, large sparse least squares problems, solution of large sparse real symmetric generalized eigenproblems, out-of-core solution of large dense systems of linear equations, out-of-core solution of real symmetric dense generalized eigenproblems, and out-of-core computation of 2D and 3D FFTs.