http://tre.ngfl.gov.uk/ Primary to GCSE. Covers all of the national curriculum.

http://www.freeexampapers.com 10000 exam papers free, all subjects, all levels. 

http://www.ams.org/online_bks/online_subject.html The American Mathematical Society. Library of published books available for download.

http://www.happychild.org.uk/wks/math/index.htm Covers all of National Curriculum from primary to A Level. Lots of explanations.

http://library.cern.ch/derobbio/mathres/mathres1.html#e-jouh Underaduate and Postgradute Reference Library with lots of e-books and e-journals.

http://www.tech.plym.ac.uk/maths/resources/PDFLaTeX/mathaid1.html Good for A Level Maths and Further Maths students. Some Physics.

http://us.geocities.com/alex_stef/mylist.html Free Undergraduate level textbooks. May be downloaded/printed

http://www.gallup.unm.edu/~smarandache/eBooks-otherformats.htm A "Digital Library of Science", with lots of e-books from Maths, Philosophy and Physics. Undergraduate and Postgraduate. Books may be dowloaded and printed.

http://historical.library.cornell.edu/math/browse.html Cornell University Historical Maths monologues. Mostly for historians.

http://arxiv.org/ Research archive for mathematicians and physicians.

http://en.wikipedia.org/wiki/Main_Page Searchable maths and science encyclopedia.

http://freestatistics.altervista.org/math.php Free maths software, up to degree level.

http://www.freedownloadscenter.com/Search/math.html More free software. Includes equation editor that you can use in Word.

http://eqworld.ipmnet.ru/ Libray of formulae. A reference library.

http://www.resourcehelp.com/ Business directory.

If you spot a link you think might be useful to me or anyone visiting this website, please email it to me. My thanks in advance.