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NGSPICE
Ngspice is both the name of a development project and the name of the developed software (hmm, strange isnt'it ?). The ngspice project aims to build an open source GPLed mixed-mode/mixed-level circuit simulator. This means that the circuit simulator has to be written nearly from scratch, which is a complex and time consuming task. The project first step (and not a small one) has been to get a freely available (but not GPLed) circuit simulator, spice 3f5 and studied its code in the hope that we could use it as a base for the real ngspice (the GPLed one). While it is not possible, at the time this page is written, to base our code on spice 3f5, because of a conflict between its license and the GPL, we are trying to correct its bugs and make some improvements, providing our results to the community. This process goes in parallel with the task of writing the new simulator. We hope that Berkeley's people will change spice's license releasing it under GPL or under the new version of the BSD which has the incompatibility removed. This will surely speed up the coming of the real ngspice.
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