AxisFlow is a precision drawing assistant for FreeCAD
For exploring cellular automata like Conway's Game of Life.
MCPower — simple Monte Carlo power analysis for complex models
Numerical and Symbolic Math Tool
Simulation and algorithms for queueing theory
FEATool Multiphysics is an easy-to-use FEA and CFD Simulation Toolbox
A library for scientific data visualization
Scientific Visualisation Made Easy
Data Visualization and Analysis
Virtual X-Ray Imaging Library on GPU
Radiation Spectrum Method : a modal BPM (Beam Propagation Method)
... the open-source glide computer
itom - an Open Source Measurement, Automation and Evaluation Software
Random phenomena generator
Open source software calculating industrial noise in the environment
Object-oriented equation-based modelling and optimisation software
The C++11 library, msvc2015u3/gcc5.4 + cmake,python,bash,vbs modules
Open-source C/C++ math engine for advanced scientific computing