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Many of these activities can be used in the classroom.

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.

This is the site I've seen recommended more than any other (as of 7-13 anyway).  You can create a class.  Free.

Live Homework help through IMCPL. Students log in using their library card number.

Although one of the main features of this site is that they link you to buy things, they are still sharing many ideas.  I thought it was interesting that they have a "permission to pin" button for pinterest.  Check out the back to school "issue".  It includes many things to buy, but also decorating, book, organizing, tech, and even clothing accessory ideas. If nothing else, it's fun to look at, and links you to some interesting teacher blogs!