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SPICE OPUS is a circuit simulator with optimisation utilities. It is a recompilation of the original Berkeley's source code for Windows 95/98/NT and Linux operating systems. 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. The graphical part of the program was rewritten but the original syntax of the plot and iplot commands was preserved, enabling any script compatibility with other SPICE compilations.