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Great multipurpose maths thinking blocks. Add different colour blocks, change their size and break into fractions. Click the 'problems' button and give lots of maths questions to work out with the blocks. http://ictmagic.wikispaces.com/Maths

This is a useful maths site for teaching place value to young children with virtual hundreds, tens and ones blocks. http://ictmagic.wikispaces.com/Maths

A project at Imperial College (UK)aimed at creating a periodic table of fundamental geometric shapes, "building blocks" "Fano varieties"

A good collection of maths questions and visual blocks to solve them. Topics include addition, multiplication, fractions and ratios. http://ictmagic.wikispaces.com/maths

Pattern blocks are great tools for developing conceptual understanding. I hope to continue to see them used in classrooms, but the virtual kind can allow students to share their thinking with other students virtually. I like using screen capture, cut/paste, upload to a wiki, comment on characteristics/size/description of '1'/and sharing with students so that their thikning can be revisited from multiple venues (home, classroom, internet-broader audience).

A fun maths puzzle. complete the triangle by placing a block with the difference of the two numbers below. http://ictmagic.wikispaces.com/Maths

Play Tetris along a numberline and use numbers to place your blocks. http://ictmagic.wikispaces.com/Maths

A superb logic game from http://www.coolmath-games.com. Change the colour of the blocks by shooting coloured balls out of a cannon. But it's not always that simple! http://ictmagic.wikispaces.com/Educational+Games

Nice set of applets that let students explore fraction understanding from multiple perspectives and models. I love that they use a variety of models for fractional development, including bars (multiple versions), sets, and linear. From the site:  "Why Fractions? Fractions are one of the earliest stumbling blocks for students in math. Our goal is building conceptual understanding in fractions as a basis for comprehension in all later topics."

"Don't know much about the French I took..." but this looks like some interesting analysis of shapes in the physics world. Worth looking at if you 

In Educator's Algebra I course, instructor Dr. Grant Fraser walks you through the building blocks of mathematics, starting from Functions, Graphs, and Inequalities, to Factoring, Polynomials, and Rational Expressions. Utilizing his 27 years of teaching experience, UCLA educated (Ph.D and B.S.) Professor Fraser carefully explains each concept from multiple angles to ensure learners of any math ability can master Algebra. Dr. Fraser finishes off every idea with a reinforcing example in addition to the four worked-out video examples and things to remember at the end of each lecture.

from the article: "it's algebra, the academic subject that more than any other strikes fear in grown-ups' hearts. But these are 5th graders. And some are struggling learners. The lesson is plenty rigorous, as you'll see. But the kids get a useful assist from the "manipulatives," concrete objects -- pawns and blocks -- that support a program called Hands-on Equations. Kids use the objects to build and break down algebraic equations."

So simple, but soooo fun and develops spatial reasoning skills and perspective

free flash game good for early years

Problem solving using interactive models

This tool enables K-6 students to build visual models of word problems. There are hundreds of built-in math problems covering thirty-six different categories. Videos explain how to model each problem type. The full screen feature makes this application compatible with interactive white boards.

This is an incredible collection!!!