PyAMS (Python for Analog and Mixed Signals) CAD approach
PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
VHDL Verification and Simulation Tool
DSpice: Design and Simulation of Circuits using Spice
A circuit simulator with graphical user interface (GUI)
Digital Circuits Design and Simulation
Solves symbolic electrical AC circuit equations
IEC 104 RTU Server Client Simulator Source Code Library Win Linux
A Cross Platform and Open Source Electronics Design Automation Suite
Real Time Electronic Circuit Simulator.
Integrated Development Environment (IDE) for learning HDL
Digital circuit simulator
AVR simulator IDE
Simple and intuitive 2D vector drawing for electronics and not only.
Optimer: a SPICE base electrical/ electronic circuit optimization tool
Penthode simulates, draw and plot electrical power distributions
The Future of the Java Circuit Simulator