OpenGL Mathematics (GLM)
Google's software suite for combinatorial optimization
Computational geometry and spatial indexing on the sphere
CUDA Templates for Linear Algebra Subroutines
The Computational Geometry Algorithms Library
Matlab toolbox for Geometry Processing
C++ library for half precision floating point arithmetics.
fast C++ library for linear algebra & scientific computing
Open source finite element software for multiphysical problems
2D & 3D TeX-Aware Vector Graphics Language
General Mission Analysis Tool
For exploring cellular automata like Conway's Game of Life.
Framework for numerical computations, data analysis and visualisation
Numerical and Symbolic Math Tool
statistical tests & psuedo- random number generators (RNGs, PRNGs)
System dynamics program with additional features for economics
Android, UIQ 3.0, Series 60 Edition 5 open-source software
Open-source C/C++ math engine for advanced scientific computing
MathMod is a mathematical modeling software
MCPower — simple Monte Carlo power analysis for complex models