Can you suggest any programs for radio amateurs for calculating electronic circuits?

Question

linux

Hello, can you suggest any good programs for radio amateurs on X86 and NIX platforms. For calculations of circuits with semiconductor elements? Resistors, transistors, capacitors, diodes, various consumers.

Answer 1

Qucs - open-source CAD for modeling electronic circuits /
Circuit Simulator v1.6i - the easiest and most convenient tool for testing the performance of the simplest circuits. I liked.

Answer 2

multisim, proteus?