SUMO is a microscopic, multi-modal traffic simulation.
ProStack - a platform for image processing and analysis
MCPower — simple Monte Carlo power analysis for complex models
Renewable Energy Network tool
A small Arduino library for GSM modules, that just works
RSSceSim - Reputation System Scenario Simulator
EXperimental REplicator COllider
BlueSky Open Air Traffic sim, (Windows/Linux/Mac, Python 2.x based)
FDA's f2 computation with bootstrap technique
2D physics engine and simulation
Javafastcomplex has both mutable and immutable complex numbers