ArXiv - Open e-print archive with over 100,000 articles in physics, 10,000 in mathematics, and 1,000 in computer science. (Formerly called xxx; free) JSTOR - Scans of print journals, with 10 major math journals (requires subscription). Electronic Research Archive for Mathematics (The Jahrbuch Project) - A digital archive of the most important mathematical publications of the period 1868-1942 and a database based on the "Jahrbuch über die Fortschritte der Mathematik". Front for the Mathematics ArXiv - User-friendly front end for the mathematics section of the arXiv (free). MathSciNet - Math Reviews: AMS database of more than a million reviews and abstracts of math publications (requires subscription). MR Lookup - Bibliographic data from Math Reviews without the reviews (free). The Electronic Library of Mathematics - The Electronic Library of Mathematics is offered by the European Mathematical Society (EMS) in cooperation with FIZ Karlsruhe / Zentralblatt MATH. Online journals, article collections, and monographs in electronic form: access is free. EMANI - Electronic Mathematical Archiving Network Initiative: to support the long-term electronic preservation of mathematical publications. Mathematics Journals Ranked by Impact - ISI impact factors up to 2000. EMIS: Mathematical Journals - Full text from about 40 research journals (free). Fachinformationszentrum Karlsruhe (FIZ) - Information services for academic and industrial research. Access to MATH Database (Zentralblatt für Mathematik), International Reviews on Mathematical Education (Zentralblatt für Didaktik der Mathematik), CompuScience and index to Springer Lecture Notes in CS. Zentralblatt MATH - European database of reviews and abstracts of math publications. Requires subscription, but has limited free access.