Although there is lots of excellent open source software available for computational chemistry and cheminformatics one would be narrow minded if they ignored the large array of commercial software also available.
Unfortunately, in an academic setting the cost of this software is far beyond the limited budgets available. Most companies offer discounted prices for academia, which is great, but some have gone further. Namely, ChemAxon and OpenEye offer free academic licenses.
So if you're in academia and fancy getting your hands on commerical software I'd follow these links: