PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
Digital Circuits Design and Simulation
PyAMS (Python for Analog and Mixed Signals) CAD approach
VHDL Verification and Simulation Tool
Solves symbolic electrical AC circuit equations
AVR simulator IDE
Optimer: a SPICE base electrical/ electronic circuit optimization tool
Penthode simulates, draw and plot electrical power distributions
The Future of the Java Circuit Simulator
TCAD Device Simulator
Real Random Number Generator
Alpha Numeric Liquid Crystal Display simulator