Free chemical engineering software for windows

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Caerfai Chemical Simulation is a simple tool that is trying to simulate chemical reactions.
The model is much too simple to be useful, but it gives some nice images and animations. Source is included and offers a nice starting point for similar endevours.
Every atom in the simulation is a moving ball which bounces on other atoms and the edges of the window. Atoms can bind to each other, similar to how things work in reality. Well start out with just radicals and build molecules from there. In reality, this is pretty much where it stops, but I break up the molecules everytime they bounce, in order to create more interesting structures. Less chemical, but more fun.
Breaking up the molecules when in reality they would break, would complicate the program a lot beyond the current few hundred lines and anyway, the reaction would occur almost never, as it happens in reality (but there the molecules go so fast that it seems quite quickly, especially if your sleeves have gotten on fire)

Free for academic and personal use, a Netscape Plug-in viewer allows scientists to view chemical information directly on a Netscape Web page.

Accepts up to ten chemical species as input and produces one or more balanced chemical equations. If no balanced equations exist for the given species, the user is informed that none can be produced. The rapid balancing of the chemical equations makes this program a useful tool for students and teachers alike!