This is a link to someone's Diigo collection of Maths sites in the UK, with over 400 bookmarks!!
Incredibly well documented and resources we need to investigate in detail
Martin Burrett 19 Aug 11 09:32:38
Nrich is a vast maths site with great interactive games and resources for young children right up to college mathematicians.
"Free tutorials using java applets to explore, interactively, important topics in precalculus such as quadratic, rational, exponential, logarithmic, trigonometric, polynomial, absolute value functions and their graphs. Equations of lines, circles, ellipses, hyperbolas and parabolas are also explored interactively. Graph shifting, scaling and reflection are also included. The definition and properties of inverse functions are thoroughly investigated. A graphical approach to 2 by 2 systems of equations is included. "
"Each task includes a task worksheet and teachers guide (containing all the required materials) and a presentation for projection (optional for most tasks)."