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Encyclopaedia of Mathematics
The Online Encyclopaedia of Mathematics is the most up-to-date and comprehensive English-language graduate-level reference work in the field of mathematics today. This online edition comprises more than 8,000 entries and illuminates nearly 50,000 notions in mathematics.
From the maker of Mathematica, an extensive mathematical reference, compiled by Eric Weisstein with assistance from the mathematics community.
Jahrbuch Project : The Electronic Research Archive for Mathematics
Digital archive and index of mathematical publications from the period 1868-1942. Searchable database based on the Jahrbuch uber die Fortschritte der Mathematik.
A freely accessible mathematics encyclopedia. Subject categories use the same classified arrangement as the MathSciNet database.
EqWorld - The World of Mathematical Equations
Provides information on solutions to algebraic, differential, integral, and other types of mathematical equations.
Sprott's Fractal Gallery
A very interesting website with new fractal images generated daily.