ASTRA Resources on Mathematics

• DIMACS, the Center for Discrete Mathematics and Theoretical Computer Science
• GAP research group on Groups, Algorithms, and Programming
• GNU Octave, mostly compatible with MatLab
• History of Mathematics
• MathWorks, developers of MatLab
• On-Line Encyclopedia of Integer Sequences
• PlanetMath
• Wolfram Research, developers of Mathematica
• World of Mathematics