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Math

Geogebra: Excellent math and science software. Provides interactive algebra, geometry, stats and calculus. For elementary grades through college. Hungry Teacher: Engaging math lessons (free) PEMDAS: Please Escuse My Dear Aunt Sally - The order of operations clearly explained

• Illuminations
  Essential resource that contains activities, lessons, standards and web links for the classroom. Developed by the National Council of Teachers of Mathematics (NCTM).
• Math is Fun
  Learning math at any level can be fun
• Math Warehouse
  All levels including algebra, geometry and trig. Great interactives.
  
• Basic Mathematics
  Does include some ads for paid services, but many good free tools.
• Math Playground
  Some ads. Easy to search. Great online manipulatives.
• Cool Math
  While away the hours and learn as well.
• A Plus Math
  Java and Flash based games.

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Cross-Curricular Resources

• FREE
  Federal Registry for Educational Excellence (FREE) is sponsored by the U.S. Department of Ed. It is encyclopedic in scope; very well organized; easy to search.
• Schrockguide
  Kathy Schrock's Guide to Everything maintains a list of excellent Internet resources organized by Subject Access. It is extremely easy to navigate. You will also find Teacher's Helpers and Kathy's own new picks of the month. This site is a "must bookmark" for all.