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