Web Directory / Mathematics / Philosophy of Mathematics
Canadian Society for History and Philosophy of Mathematics (http://www.cshpm.org/) - Philosophy of mathematics resources.
Encyclopedia Britannica - Philosophy of Mathematics (http://www.britannica.com/eb/article?eu=115099)
Epistemlinks.com - Philosophy (http://www.epistemelinks.com/Main/MainTopi.aspx) - Links to different subdivisions of philosophy.
History and Philosophy of Mathematics (http://www.gustavus.edu/oncampus/academics/philosophy/lhpm.html) - Some links.
Philosophy of mathematics (http://www.math.psu.edu/simpson/papers/philmath/node18.html) - Some articles.
Philosophy of Mathematics (http://www.bu.edu/wcp/MainMath.htm) - Some articles.
The Philosophy of Mathematics (http://www.rbjones.com/rbjpub/philos/maths/) - Some articles on philosophy of mathematics.
Philosophy Resources on the Internet (http://www.herts.ac.uk/humanities/philosophy/intersci.html) - Some links to philosophy and philsophy of mathematics resourcesl.
National University of Singapore (http://www.scholars.nus.edu.sg/quantitative/relatedlinks.html) - Philosophy of Mathematics resources.
Stanford Encyclopedia of Philosophy (http://www.seop.leeds.ac.uk/archives/win1999/entries/mathphil-indis/) - Arguments in the Philosophy of Mathematics