arXiv.org
arXiv is an electronic archive and distribution server for research articles. Covered areas include physics, mathematics, computer science, nonlinear sciences, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics.
arXiv.org: Prvides open access to over 1 million e-prints in physics, mathematics, computer science, quantitative biology, quantitative finance, and statistics. arXiv is Open Archives Iniative (OAI) compliant and is owned, operated, and funded by Cornell University, and is partially funded by the National Science Foundation.