SPICE OPUS is a circuit simulator with optimisation utilities. It is a recompilation of the original Berkeley's SPICE for GNU/Linux operating system too. Georgia Tech Research Institute's XSPICE mixed-mode simulator was added to the Berkeley code. The simulator includes an interactive interpreted programming language called Nutmeg, which allows interactive SPICE sessions (in a similar way to ngnutmeg for NGSpice). In this new version of SPICE OPUS;

• Bug fixed in BSIM3SOI version 1.3 (level = 55) MOSFET model.