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"Mathigon provides a series of free, interactive, online courses that are designed to complement 6th grade through college level mathematics instruction. The website was founded by Philipp Legner, who studied mathematics at the University of Cambridge and mathematics education at the London School of Economics. Legner, who currently works at Google, wanted to design a website that enabled learners to examine mathematics concepts by actively engaging in problem solving. Each course explains key concepts and skills through a series of short explanations, helpful visualizations, problem sets, and quizzes. Learners receive feedback as they work their way through each course. Visitors to this website can find courses by browsing through the course library, which sorts available courses by grade level (6-9; 10-12; College, Fun and More) and by topic (Geometry; Functions and Equations; Probability and Statistics; Calculus and Mechanics; Applied Mathematics, etc.)."

This site provides an extensive collection of free resources, math games, and handson math activities aligned with the Common Core State Standards for Mathematics. Our math printables are suitable for use in math centers, small group or whole class settings. Instructions for each activity are presented in large print on a task card in child-friendly language to enable students to work on tasks independently after a brief introduction to the task. All materials and activities on the site are designed to support the Common Core State Standards and are based on the belief that effective mathematical learning is best achieved when students are given frequent opportunities to develop their own problem solving strategies, to pose questions, and to engage in mathematical inquiry through the use of open-ended tasks.

Teachthought describes this as "While the site is simple a crudely interactive graphic with links to videos, it has, in one fell swoop, creatively curated some of the most compelling and engaging "problems" in mathematics. From Benford's Law to French Numbers, to whether or not zero is an even number, it frames the content area of math-which is often riddled with rote practice of very traditional arithmetic and formulas-in a problem-based learning kind of approach. Fantastic resource for bell ringers, test questions, math project-based learning ideas, or as a model for students to curate their own curiosities about the incredible-and poorly marketed-world of mathematics."

Calculation Nation® uses the power of the Web to let students challenge opponents from anywhere in the world. At the same time, students are able to challenge themselves by investigating significant mathematical content and practicing fundamental skills. The element of competition adds an extra layer of excitement

This video is by a friend of mine in Kansas.

There is a useful tour describing this site. (out of the UK)

Problem solving is the heart of mathematical learning. This site complements existing curricula by providing a resource for teachers who use, or are only beginning to use, a problem-centered approach. This resource will also help parents and tutors support problem-based learning in out-of-school settings.

Website with lots of real-world math activities, esp. lots with food!

Mangahigh.com is one of the world's first games-based-learning sites, where students learn Mathematics via purpose-built casual games that balance fun and learning.

Welcome to the TESiboard collection,a purpose built library of visual, dynamic,interactive resources.TESiboard resources are primarily openendedtools that enable teachers to enagagetheir pupils in a learning dialoguearound the resource.The resources are designed for use by theteacher on their interactive whiteboardbut many are also suitable for pupil use,usually responding to a task or challengeset by the teacher.The TESiboard materials were acquiredby TSL Education Limited at the end ofNovember 2009 and as a result of TSL'scurrent and planned future investment,all these popular resources are availablefor free.

The Math Forum was awarded a generous grant from the FINRA foundation to supportthe work of connecting math teachers to each other and to useful resources to includefinancial content in their math classrooms. This website is the result of prior and ongoingconversations with teachers, financial educators and Math Forum staff.

Math 2.0 interest group.  Lots of great resources; this group has their own webinars, and now even F2F get togethers!