Spice Circuit Simulator
Micro-Cap 11 - Spectrum Software (Spectrum Software)
Micro-Cap 11 is an integrated schematic editor and mixed analog/digital simulator that provides an interactive sketch and simulate environment for electronics engineers. Since its original release in 1982, Micro-Cap has been steadily expanded and improved. Micro-Cap 11, the eleventh generation, blends a modern, intuitive interface with robust numerical algorithms to produce unparalleled levels of simulation power and ease of use. Nothing else comes close.