Some colleagues of mine build a similar tool, <a href="http:&#x2F;&#x2F;molcalc.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;molcalc.org&#x2F;</a><p>It gives you access to a lot more properties of the molecule you build than just the energy: Thermodynamics, solvation energies, vibrational frequencies etc.