Agena is an interpreted procedural programming language.
Calc: arbitrary precision C-like arithmetic & calculator
Open-source C/C++ math engine for advanced scientific computing
Command-line calculator and libray.
Numerical mathematics platform, Matlab alternative
mathSuite Speed & Matrix Stream Processor
Powerful Calculus Environment and Matrices Handling Engine
Complex error functions, Dawson, Faddeeva, and Voigt function
library for Bilinear Pairing
One of the best simple arithmetic calculator!
GCFP is an open-source tool for visualizing complex functions.
The Advanced Algebraic Language.