http://www.chemistry.org The official website of the American Chemical Society (ACS). The organization is a wealth of information about all aspects of chemistry, from jobs, scholarships and teaching to the latest research and development.

http://www.aist.go.jp/ National Institute of Advanced Industrial Science and Technology (AIST).

http://www.acdlabs.com/download/chemsk.html ChemSketch.

http://www.mdli.com/downloads/downloadable/index.jsp http://www.aist.go.jp/RIODB/SDBS/menu-e.html Integrated Spectral Database System for Organic Compounds (SDBS) is a searchable database of spectral information that is maintained by AIST(see above). User friendly and a good resource for structure confirmation of many organic compounds.

http://spectra.galactic.com/SpectraOnline/Default_ns.htm ThermoGalactic Online is a good database for searching IR and obtaining physical properties/constants.