OpenGL Mathematics (GLM)
Computational geometry and spatial indexing on the sphere
Matlab toolbox for Geometry Processing
Google's software suite for combinatorial optimization
The Computational Geometry Algorithms Library
CUDA Templates for Linear Algebra Subroutines
General Mission Analysis Tool
fast C++ library for linear algebra & scientific computing
Open source finite element software for multiphysical problems
C++ library for half precision floating point arithmetics.
For exploring cellular automata like Conway's Game of Life.
2D & 3D TeX-Aware Vector Graphics Language
statistical tests & psuedo- random number generators (RNGs, PRNGs)
Data Visualization and Analysis
Framework for numerical computations, data analysis and visualisation
Command-line operators for netCDF and HDF files
System dynamics program with additional features for economics
Numerical and Symbolic Math Tool
A cross-platform fractal explorer
Android, UIQ 3.0, Series 60 Edition 5 open-source software