OpenGL Mathematics (GLM)
Matlab toolbox for Geometry Processing
Computational geometry and spatial indexing on the sphere
Google's software suite for combinatorial optimization
The Computational Geometry Algorithms Library
CUDA Templates for Linear Algebra Subroutines
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
MCPower — simple Monte Carlo power analysis for complex models
2D & 3D TeX-Aware Vector Graphics Language
Numerical and Symbolic Math Tool
statistical tests & psuedo- random number generators (RNGs, PRNGs)
Android, UIQ 3.0, Series 60 Edition 5 open-source software
Data Visualization and Analysis
System dynamics program with additional features for economics
Command-line operators for netCDF and HDF files
MathMod is a mathematical modeling software
Precision Trigonometry: Advanced Calculator for Complex Math