Collections

All NRICH games

Several excellent games from Manga High.
Note that Manga High is now completely free to UK schools.

John-Paul Green’s FlashyMaths has several excellent resources.

Math is fun – numerous games on their games pages.
Games2 includes a Parking lot game – similar to Rush Hour.
This page also has Tangrams.

Try RayRay!

Math Playground

Count On games collection

I Love Maths Games (E Hughes)

Subtangent – Games ( Duncan Keith)
Note that the Weakest Link link does not work from this site, see the maths page here.

From Oswego City School District comes this collection – which includes games for younger students. These games are very good for mental arithmetic practice. Also note the Power Lines game.

Sheppard Software 

Math Games from Jefferson Lab (Thomas Jefferson National Accelerator Facility – Office of Science Education).