#6582
Logic Circuit Simulator Pro is an advanced and friendly Android application designed for electronics enthusiasts and professionals, developed by Stefan Belinov from Bulgaria. Whether you are a student learning about logic circuits or an experienced engineer working on complex projects, this simulator has everything you need.

#6362
Fritzing is a free (pay to download), open-source electronic design automation software for Windows, Mac and Linux platforms, developed by Interaction Design Lab Potsdam from Germany, using C++. It simplifies what PCB layout engineers did in the past, all using drag & drop method to easily finish complex circuit design.