Qucs, also known as a Universal Circuit Simulator, a tool for you to verify its performance in a much planned way to design integrated circuits.
This is a comprehensive component can be inserted into a data base that includes circuit. Resistance, voltage sources, diodes, transistors, gates, LED, bridge, etc. Each one has its own electronic properties
Qucs also known as QucsTranscalc through the transmission line and radio frequency module can calculate the electronic properties. It makes manually in order to obtain a specific result value introduces a variety of parameters.
Although this is a much more developed Qucs another similar tool, Ki cad is. It's your choice.