Find below a list of websites on mathematics to explore. Suggestions are welcomed (director@cimpa.info).
Images des Mathématiques
Website dedicated to the popularization of mathematics (in French)
MacTutor History of Mathematics Archive
A comprehensive site for mathematics history
Mathematics Genealogy Project
A database for the academic genealogy of mathematicians
MathOverflow
A question and answer site for professional mathematicians
Numberphile
Videos about numbers and stuff
The On-Line Encyclopedia of Integer Sequences
An online database of more than 250,000 integer sequences
Virtual Math Museum
A virtual "mathematical museum" being developed by an international group of mathematicians called the 3DXM Consortium