The emerging set of interactive simulations at PhET that now use HTML5 and work solely within a modern browser. These are heavy in the physical sciences... but also include acid-base, atomic structure, chemical equations, etc.
This is more than pure neuroscience. There are all sorts of options for looking at general physiology, scientific processes, etc. Save this site for sure. If I were back in the classroom, I would go crazy in the "store" section. Or rather, I would compel my supervisor to "go crazy" in that store. Such a well done set of resources as well...