Links

Libraries

• Mathematic Ressources ETH-Bibliothek
  Ressources and information about mathematics at the ETH-Bibliothek
• Knowledge Portal ETH-Bibliothek
  Collection and more resources of the ETH-Bibliothek
• Swissbib
  Metacatalog of the Swiss university libraries and the Swiss national library
• e-lib
  Swiss portal for academic information research
  
• Virtuelle Fachbibliothek Mathematik (Deutschland)
  Search for mathematical information in library catalogs, reviews, preprints,  journals and also for internet sites covering mathematics
• WorldCat
  Collections and services of more than 10,000 libraries worldwide
  

Bookseller

• Bookfinder
  Searches and compares new, used, rare and out-of-print books for sale by online booksellers like Amazon, Abebooks, buch.ch and so on
• Google Books Search
  Mathematical books on Google

Databases

• MathSciNet
  Database with reviews, abstracts and bibliographic information (from 1940)
• Zentralblatt MATH
  Abstracting and reviewing service in pure and applied mathematics (from 1868)
• MathEducDatabase
  Reference database offering a world-wide overview of literature on mathematics education
• Fachportal Pädagogik
  Collection of educational databases
  
• ISI Web of Knowledge
  Interdisciplinary database
  

Preprints and Repositories

• Arxiv
  Open access to e-prints in mathematics and other subjects
• HAL Open Acces Archive
  Multi-disciplinary open access archive for the deposit and dissemination of scientific research papers, whether they are published or not, and for PhD dissertation
• ZORA (Zurich Open Repository and Archive)
  Access to the research and scholarly output of the University of Zurich

Further More

• Tricki
  A wiki-style collection of references, mathematics tricks, techniques and methods
• Mathoverflow
  A question-and-answer web site for mathematical students and researchers  (starting at the Master level roughly)
• Math Logic and Math Problems
  All kinds of puzzles and games
  
• EducETH - Materials for Education
  Center of competence for teaching and learning at the ETH Zurich
• E-Learning Project: Lemuren
  Multimedia-bases learning at the Department of Mathematics
• Genealogy Project
  Genealogy of mathematicians and their PhD students
• Mathematics Subject Classification (MSC2010)
  Classification system of the American Mathematical Society