Resources for your own research.
Please don't forget to read the recommandations and the privacies on each website to know what you can download or not; and how you can do it (inscriptions, subscription, taxes, fees...). Respect the intellectual property.
www.ams.org (American Mathematical Society)
www.arXiv.org (Cornell University)
www.aip.org (American Institute of Physics)
www.mit.org (The M.I.T.)
www.nature.com (The wellknown electronic journal)
http://www.mathnet.ru/index.phtml?&option_lang=eng
(Russian Academy of Sciences; also in english)
www.calphysics.org (The Calphysics Institute)