Periodic table shows colors of elements (I used ones from Jmol).

No exports yet, though in Firefox you can save any canvas element as PNG just by right clicking on it. Maybe for other browsers I could add PNG export via data URI.

Proteins are tough. When you get into thousands of atoms, performance is unsatisfactory, it's pushing browsers to limits.

Firefox is especially problematic because of weird memory behavior - it's growing a lot (on simple array assignments) and then it stutters on garbage collecting.

Chrome is much better, though interestingly for the most complex molecules new Opera is the fastest.

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Edit: I added PNG export.