Collaborative Group for Research in Mathematics Education
In the summer of 1665, Isaac Newton first came up with the idea of calculus, after being hit over the head with a soft, blunt object. If it had been a hard blunt object, he may have forgotten the whole idea, and thus would have saved millions of college students from much excruciating pain and suffering. Unfortunately he didn't, and after publishing most of his findings, suffered a nervous breakdown in 1693.
This page has some good calculus links

Chaos: A pictorial introduction. This presentation illustrates
some essential features of the theory of "chaos" which
has received media attention in recent years. It also tells the
story of a contribution to the theory by the School of Mathematics
at La Trobe University. This pictorial introduction is best
viewed by a web browser that supports gif animations. The
presentation was devised by John Banks.
See, also, this department's Quicktime
movies of surfaces. Quicktime movie viewers for Macintosh OS
and Windows are downloadable via this site.
This is a National Science Foundation sponsored project designed
to help secondary school and college teachers of mathematics
bring contemporary topics in mathematics (chaos, fractals,
dynamics) into the classroom, and to show them how to use
technology effectively in this process. At this point, there are
several interactive papers available. These are designed to help
teachers understand the mathematics behind such topics as
iterated function systems (the chaos game) and the Mandelbrot and
Julia sets.
Eric Weisstein's World of Mathematics. An incredibly thorough
mathematics encyclopaedia from Eric Weisstein. Each entry
includes extensive cross-referencing to related topics, as well
as a bibliography.
These pages contain a collection of usenet clippings, web
pointers, lecture notes, research excerpts, open problems,
geometry papers online in non-geometric locations, and other
stuff related to discrete and computational geometry. Topics:
Circles and Spheres, Coloring, Combinatorial Geometry, Covering
and Packing, Dissection, Fractals, Geometric Models, Geometric
Topology, Hyperbolic Geometry, Knot Theory, Lattice Theory and
Geometry of Numbers, Nearest Neighbors and Voronoi Diagrams,
Origami, Polyhedra and Polytopes, Rectilinear Geometry, Symmetry
and Group Theory, Tiling, Triangles and Simplices, Width,
Diameter, and Geometric Inequalities, Planar Geometry,
Three-dimensional Geometry, Many-dimensional Geometry, Open
Problems, Software and Animations, Miscellanous, Recent Additions
to the Junkyard.
History of Mathematics at Clark University, U.S.A.
The Largest Known Primes. Recently computers and cryptology
have given a new emphasis to search for ever larger primes--at
this site there are lists of thousands of these record breaking
primes, all of which have over 1,000 digits! The complete list of
approximately 20,000 primes is available in several forms.
MacTutor
History of Mathematics Archive, School of Mathematical and
Computational Sciences University of St Andrews, St Andrews,
Scotland. Contains: Biographies Index, Famous curves index (NOW
WITH JAVA), History Topics Index , Birthplace Map, Mathematicians
of the day, Anniversaries for the year, Chronologies.
The Mathematical Olympiads: A Chance to Stretch Your Mind. The first International Mathematics Olympiad was held in 1959 in Romania with seven countries participating. Every year since, an International Mathematics Olympiad has been held in places as far apart as Havana, Canberra and Beijing, with an ever-increasing number of teams participating.
Patterns, Programs, and Links for Conway's Game of Life . A page of odds and ends about Conway's Game of Life. The page contains descriptions of files available for ftp, links to Life resources available elsewhere on the Internet, new results and patterns not archived elsewhere, and a browsable hypertext catalog of Alan Hensel's archive of Life patterns, including a hypertext version of his Life glossary.

Polyhedral
Solids. The study of polyhedra is one of those special areas
of mathematics which allows the amateur and expert to work with
an equal delight. Many of the solids displayed here are quite
attractive, and the many relationships between the various solids
can be quite surprising and delightful. What sorts of solids with
flat sides are there? One approach (and the one taken here) is to
answer this question using the most restrictive constraints. This
yields the Platonic Solids. Once this is done we can relax the
constraints in various ways to see where they lead. Several of
the paths are followed in the sections offered.

The UL fractal. There are many popular texts dealing with some
well known fractals, but how does one go about designing a
fractal which looks close to some given image? This will show you
how to design a fractal based on any set of initials.
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Virtual
Polyhedra
by George W. Hart, Department of Computer Science, Hofstra
University. This site is a self-contained easy-to-explore
elementary tutorial, reference work, and object library for
people interested in polyhedra. You may choose to simply view the
virtual objects for their aesthetic value, or to read the related
mathematical background material at various levels of depth.
Women Mathematicians. Biographies of Women Mathematicians - part
of an on-going project by students in mathematics classes at
Agnes Scott College, U.S.A., to illustrate the numerous
achievements of women in the field of mathematics.