APlusMath - Algebra Planet Blaster: This game gives you an equation and you have to blast the planet with the correct solution. (contributed by Beth Postema, MCC Student, Winter 2007)

BBC Planet Hop: This one makes graphing points fun for students with an interactive game.  Students also have to find the equation of the line. (contributed by Emily Coffey, MCC Student, Winter 2007)

(personally, I've got to say that Planet Hop was totally cool - I got sucked in to playing it and it's very well done)

HotMath Algebra vs. The Cockroaches: This is a game to help students understand the equation of a line. The first level is really easy, but Round 2 gets harder. (contributed by Kristina Tabaczka, Math on the Web Participant, MCC, Winter 2007)

(wow - this one has very well-done graphics!)

GameQuarium Algebra Section:  I think you could play on this one for quite a while with all sorts of algebra topics. (contributed by Kristina Tabaczka, Math on the Web Participant, MCC, Winter 2007)

Interactivate Algebra Section: This site is awesome! It has stuff for every age. In the Algebra section, I especially like the Linear Function Machine, Graph Sketcher, and Maze Game. There is a lot of cool stuff on this site!  (contributed by Kristina Tabaczka, Math on the Web Participant, MCC, Winter 2007)

PurpleMath.com: Here’s one that I recommend to my intermediate algebra students. They offer detailed explanations of a whole variety of algebra problems at different levels, written in language that students can understand (at least that’s what they claim). They also include links to some other good algebra sites. (contributed by John Bartley, MCC, Winter 2007)

Pacific Tech Graphing Calculator: Pacific Tech makes the 2D and 3D graphing calculator program that comes with Macintoshes. (A Windows version is also available.) Check out their Gallery of Images to see what's possible! Also check out the User's Gallery to see images and even animations posted by users. (contributed by Karen Wilson, Math on the Web Participant, MCC, Winter 2007)

NCTM Illuminations Trout Pond: I like this "Trout Pond Population" activity with printable data sheet and guidance for the instructor. The activity involves a word problem statement regarding how the trout population is to change with time, and the students are to investigate the problem numerically, graphically and algebraically. The activity is part of the National Council of Teachers of Mathematics web site. (contributed by Karen Wilson, Math on the Web Participant, MCC, Winter 2007)

Secret Worlds: The Universe Within: This is like the film "Powers of 10" only it takes less time and is online.  With every passing second, you move 10 times closer (starting 10 million light years from earth and going into the subatomic world of the atom).  (contributed by Diane Krasnewich, Math on the Web Participant, MCC, Winter 2007)

L-Squared Math Addition of Ordinates:  A nice interactive tool for showing function addition, like f(x)+g(x) graphically.  Students pick up the points and graph the sum and difference of the graphed functions.  (contributed by Maria Andersen, MCC, Summer 2007)

Visual Calculus Precalculus Section: This website provides tutorials for Calculus. However, it also includes a nice PreCalculus section with piecewise defined functions, even and odd functions, polynomials, rational functions, geometric transformations of functions, algebra of functions, composition of functions, trigonometric functions, exponential functions, inverses, logarithms, parametric equations, polar coordinates, solving equations, curve fitting, and conic sections.