Hundreds of constants, data, information on chemicals:
http://webbook.nist.gov/chemistry/
the Chemistry Education Resource Guide; quote: "chemistry study resources and chemistry teaching resources, as well as links to great blogs, journals, podcasts and a whole lot more":
http://www.smartscholar.com/chemistry-education-guide/
Drawing of chemicals and chemical formats in software:
http://openbabel.org/wiki/Get_Open_Babel
To download the OpenBabel Installer directly, choose the link below:
A free database for chemicals, here you can find the smiles notation for thousands of chemicals:
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