FlightGear Flight Simulator: free open-source multiplatform flight sim
A minimalistic digital logic simulator
A circuit simulator with graphical user interface (GUI)
An advanced network simulator to design and configure virtual networks
A network server for the flightgear simulator
The classic RPL programming language reimplemented and reimagined.
physics-based multicellular simulator
Android, UIQ 3.0, Series 60 Edition 5 open-source software
Simulator for medical emergency departments
turn-based wargame/simulator
PySCeS is the Python Simulator of Cellular Systems
Digital circuit simulator
A wireless push-type network simulator.
Modbus slave simulator