- LLEK Bookmarks Scientific Search Engines - Mathematics
- A comprehensive catalog of scientific resources and media worldwide but especially in German and English. Directories of journals; catalogs of search engines; additional starting points and sites of special interest.
- Mathematics WWW Virtual Library
- Directory of mathematical web sites, maintained at Florida State University.
- Russian Mathematical Database
- Directory of Russian mathematical organizations, departments and mathematicians; publications; library catalogues; journals; projects.