FlightGear Flight Simulator: free open-source multiplatform flight sim
A circuit simulator with graphical user interface (GUI)
X-Plane plugin that displays a tablet to aid VR usage
Fast PlayStation 1 emulator for x86-64/AArch32/AArch64
Soft-body physics simulator
Real Time Electronic Circuit Simulator.
mod_RSsim Fork with Updates
Virtual Pipe Organ Software
Android, UIQ 3.0, Series 60 Edition 5 open-source software
Highly-Experimental Playstation Simulator x64
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Physically accurate and validated GPU ray-tracer
DNP3 Outstation and client simulator, Source code Library, win, Linux
IEC 104 Source code Library for Windows c c++ c# .net
IEC 104 Source code Library for Windows, Linux, QNX, Real time OS, ARM
IEC 60870-5-101 Source code Library Stack - Windows c, c++, c# .net