很多搜尋器都提供分類目錄搜尋，例如：
- 數學 , 新浪網
http://search.sina.com.cn/search_dir/kx/zr/sx/ - 數學 , 搜狐
http://www.sohoo.com.cn/Science_Technology/Natural_science/Mathematics/ - 數學, 蕃薯藤台灣網際網路
http://www.yam.org.tw/b5/yam/sci/math/ - 數學, 奇摩站 kimo !!!
http://dir.kimo.com.tw/Science/Natural_Secience/Mathematics/ - Mathemathics, Cornell Theory Center Math and Science Gateway
http://www.tc.cornell.edu/Edu/MathSciGateway/math.html - Mathemathics, form Galaxy
http://www.galaxy.com/galaxy/Science/Mathematics.html - Mathematics, Go Education
http://www.go.com/WebDir/Education/Fields_of_study/Mathematics - Mathematics for students, K12, Go Education
http://www.go.com/WebDir/Education/K_12/Resources_for_students/Math_for_students - Math, AltaVista
http://dir.altavista.com/Science/Math.shtml - Mathematics, Yahoo
http://dir.yahoo.com/Science/Mathematics/ - Mathematics, The Gateway to information
http://www.lib.ohio-state.edu/gateway/bib/mathematics.html - Math, Netscape
http://search.netscape.com/Science/Math - Mathematics, Excite
http://www.excite.com/education/science_and_nature/mathematics/ - Mathematics, WebCrawler
http://www.webcrawler.com/education/science_and_nature/mathematics