Chem Ed Exchange
Chem Ed Exchange is a site for – you guessed it – chemistry and science teachers! They have a great deal of free content in addition to their paid content.
Middle School Science Quizzes
Education Quizzes offers a wide range of quizzes on a variety of topics. It is American in its content, but science crosses all borders.
This tool should be used as a supplemental tool and for practice quizzes. It requires payment to have an account, but the quizzes can be used without logging in.
Wolfram Demonstrations
Wolfram Demonstrations offers over 12,000 demonstrations and simulations for everything from advanced science and physics to K-2 science to arts and architecture. There is something for every teacher on this site!
School Yourself
School Yourself is a mathematics website based on doing math, not on watching an instructor do math. Their unique interactive lessons cover math subjects ranging from algebra, geometry, and trigonometry to precalculus and calculus. As you go through the lessons, their algorithms quietly crunch numbers and figure out where students need help the most, or whether they should breeze right through to more advanced material.
Because of their privacy policy, students should be 18 or older in order to sign up.
Math Planet
Math Planet is a resource for Div 4 teachers and their students. The educational material is focused on US math, but has support for algebra, geometry, SAT and ACT examinations. Math Planet is licensed with creative commons attribution, which means that anyone can use it.