Packages with the sparse use flag

dev-python / scipy : Scientific algorithms library for Python

Adds support for sparse solving with sci-libs/umfpack

sci-libs / adolc : Automatic differentiation system for C/C++

Add support for sparse matrix algebra with sci-libs/colpack

sci-libs / ceres-solver : Nonlinear least-squares minimizer

Enable support for sparse matrix algebra with various packages from SuiteSparse

sci-libs / coinor-clp : COIN-OR linear programming solver

Enable support for sparse matrix with sci-libs/cholmod

sci-libs / dealii : Solving partial differential equations with the finite element method

Add support for suitesparse (sci-libs/suitesparse)

sci-libs / matio : Library for reading and writing matlab files

Extend formats for sparse matrix (not matlab)

sci-libs / sundials : Suite of nonlinear solvers

Enable support for sci-libs/klu sparse solver

sci-libs / trilinos : Scientific library collection for large scale problems

Add support for sparse matrix solvers (sci-libs/umfpack)

sci-mathematics / octave : High-level interactive language for numerical computations

Add enhanced support for sparse matrix algebra with SuiteSparse

sci-mathematics / petsc : Portable, Extensible Toolkit for Scientific Computation

Use suitesparse (sci-libs/suitesparse) including cholmod (sci-libs/cholmod) for sparse factorization