Simulators

Today, I'll talk about ngSpice. The link is a page dedicated to this free-source simulator (in fact, it is its homepage). there you can find anything you need to download and compile one of the best simulators going around. However, the point is not only that it is a very good simulator, but that you can also implement your models there. And it's for free.... If you need more, you can also go to the gEDA project, that is a full design suite. It is more oriented to simulation of circuits than to simulation of devices, but it can be useful to device people to check the model in a full design flow.