Directory of members of numerous mathematical societies and associations, including the American Mathematical Society (AMS), Mathematical Association of America (MAA), & Society for Industrial and Applied Mathematics (SIAM).
The MathResource Dictionary was written by Jonathan Borwein and Ephraim Borowski. The database of math terms, definitions and images was originally written and published as the Collins Dictionary of Mathematics.
The web's most extensive mathematical resource, provided as a free service to the world's mathematics and internet communities as part of a commitment to education and educational outreach by Wolfram Research, makers of Mathematica.
The Scientific Graphics Project is concerned primarily with surfaces in R3 (three dimensional euclidean space). The surfaces are organized into three major categories: Minimal Surfaces, CMC (Constant Mean Curvature) Surfaces, and Level Surfaces.