Proteus PCB design is described as 'combines the schematic capture and ARES PCB layout programs to provide a powerful, integrated and easy to use suite of tools for professional PCB Design' and is an app in the Education & Reference category. There are more than 25 alternatives to Proteus PCB design for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Android. The best alternative is KiCad, which is both free and Open Source. Other great apps like Proteus PCB design are Fritzing (Paid, Open Source), Autodesk EAGLE (Free Personal), QUCS (Free, Open Source) and LibrePCB (Free, Open Source).
TINA Design Suite is a powerful circuit simulation package for analyzing, designing, and real time testing of analog, digital, VHDL, MCU, SMPS, RF, communication, optoelectronic and mixed electronic circuits and their PCB layouts.
Ngspice is a mixed-level/mixed-signal circuit simulator. Its code is based on three open source software packages: Spice3f5, Cider1b1 and Xspice. Ngspice is part of gEDA project, a full GPL'd suite of Electronic Design Automation tools.
With Solve Elec you can : - draw and analyze electrical circuits functioning in direct or alternating current - get literal formulas and values for current intensities and voltages defined in the circuit. - verify circuit related equations. - draw graphs.