This website lets you build your own jeopardy game. There is also a section that lets you browse other jeopardy games as well, to get ideas for your own.
This math website offers very challenging problem-solvin equations that require critical thinking. The website looks closely at Geometry, Algebra, etc. This can be a great website teachers can use for guidance. They can use one of the challenging problems to start off the day to wake up their students in the morning!
This website is called The Math Forum @ Drexel. Students are able to come on this website and ask questions. They can find out some information on certain subjects of Math. There is also a great section I took a look at called "Problems of the Week." This section approaches to guiding students through their problem-solving skills.