VHDL 2008/93/87 simulator
C++ Library for the Common Image Generator Interface
Frevo is probably the simplest tool for evolutionary design
Component, CA, and CCA models; superdense time, DB repo, testing, etc.
Industry standard communication with compliant image generators.
PySCeS Constraint Based Modelling
Small factory simulator for control logic test purpose
Real Random Number Generator
LIME is a software tool for creating multiphysics simulation codes.