- http://www.emis.de/ZMATH/en/zmath.html - Zentralblatt Math is an excellent searchable database of math journals from 1931 to the present.
- http://www.maths.usyd.edu.au:8000/MathSearch.html - To search a collection of over 200,000 documents on English-language mathematics and statistics servers across the web, just use MathSearch. Most of the material indexed in this database is research-level and university mathematics. But don't be shy kids; jump right in.
- http://front.math.ucdavis.edu/ - The Mathematics ArXiv (pronounced "archive") contains thousands of mathematical articles, searchable by author, title, or keyword. Again, pretty much upper-level mathematics here.
- http://www.enc.org/resources/search/ - Here's a site that can be useful to just about anyone, if used correctly. The real purpose of Eisenhower National Clearinghouse (ENC) is to identify effective curriculum resources, create high-quality professional development materials, and disseminate useful information and products to improve K-12 mathematics and science teaching and learning. But if you're anyone, including a student looking for some math info, you can use their search to find websites that deal with the topic you're working on. You can even select the approximate grade level of the results returned to you.
- http://archives.math.utk.edu/topics/ - Here's another good datbase for students. The Math Archives provides a browseable directory of math topics, as well as a search box to look for topics by keyword. When you search by keyword, it will display a results page with a link and description of the page, as well as a rating of the approximat grade level of the page. This is an excellent resource for students.
- http://www-groups.dcs.st-and.ac.uk/~history/Search/historysearch.cgi - Everything you ever wanted to know about mathematicians, and then some. The MacTutor History Archive has a searchable database of mathematicians, with links to biography pages. You can find just about anyone in here. Search by their name or the field of math they studied.
- http://at.yorku.ca/amca/conferen.htm - Atlas Mathematical Conference Abstracts allows you to search and browse a database of conference announcements and conference abstracts. If you're looking for information on upcoming conferences, this would be the place to go.
- http://www.math-atlas.org/ - The Mathematical Atlas website was designed with the visitor in mind who wants to know something about a topic in mathematics - why it's interesting, how it fits in with the rest of mathematics, and how it may be useful for solving some problem in or out of mathematics. The site looks simple at first, but when you dig into it a bit, there's a ton of good information to be found. We're impressed.
- http://www.education-world.com/math/ - This is Education World: MathRealm. They have links to math resources on the web, subcategories of math topics, complete with tools and lessons for each.
