
Multisim
LTspice
QUCS
EasyEDA
Proteus PCB design
KiCad
Pspice
Altium Designer
Diode
Computer Museum
Flux
Appetize
Autodesk Fusion 360
Arduino
RedReader
EasyCircuit
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.
Computer Museum - Online computer simulator.
QUCS - Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit.
Flux - Application Architecture for Building User Interfaces
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.
Appetize - Appetize provides enterprise Point of Sale and inventory solution.