OpenGL Mathematics (GLM)
The Computational Geometry Algorithms Library
Matlab toolbox for Geometry Processing
Google's software suite for combinatorial optimization
CUDA Templates for Linear Algebra Subroutines
Computational geometry and spatial indexing on the sphere
fast C++ library for linear algebra & scientific computing
General Mission Analysis Tool
C++ library for half precision floating point arithmetics.
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
statistical tests & psuedo- random number generators (RNGs, PRNGs)
Numerical and Symbolic Math Tool
System dynamics program with additional features for economics
Data Visualization and Analysis
MathMod is a mathematical modeling software
Android, UIQ 3.0, Series 60 Edition 5 open-source software
Command-line operators for netCDF and HDF files
Social Network Analysis and Visualization software
Precision Trigonometry: Advanced Calculator for Complex Math