SPICE OPUS is a free general purpose circuit simulator especially suited for optimization loops. It is a recompilation of the original Berkeley source code for Windows and Linux operating systems. Later Georgia Tech Research Institute's XSpice mixed-mode simulator was added to the Berkeley code. The XSpice code model feature was enhanced so that code models can be loaded from .dll/.so files (.cm files). The simulator includes an interpreted programming language called Nutmeg, which allows interactive Spice sessions. Numerous memory leaks were fixed.
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