Open-Source Multiphysics FEA (FEM) Package
Allows you to build your own circuits and test them
Flexible and eXpandable Cpu simulation
3-D diffusion solver for biological problems
The Repast Suite is a family of free agent-based modeling libraries.
Simulation, analysis, and management of the movement of water
Command Centre
Science simulator and advanced calculator based on modules
Toolkit for Automatic Control and Dynamic Optimization
Framework to help researchers test their discovery algorithms.