Here are some random mathematical links I've come across:

• Mathematician of the Day
  From School of Mathematics and Statistics, University of St Andrews, Scotland
• Mathematical Programming Glossary
  Maintained by Professor Harvey J. Greenberg, Mathematics Department, University of Colorado at Denver
• MathVoc
  ENGLISH - FRANÇAIS - ESPAÑOL translations of mathematical terms
• The History of Mathematics
  David R. Wilkins, Trinity College, Dublin