| FFTW | C subroutine library for computing the Discrete Fourier Transform (DFT) | |
| CLAPACK | Provides routines for solving systems of simultaneous linear equations, least-squares solutions of linear systems of equations, eigenvalue problems, and singular value problems (LAPACK Users' Guide). | |
| Qhull | Qhull is an implementation of the Quickhull algorithm for computing the convex hull. |