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This Syvum site provides math puzzles and brain teasers for students at varying levels (easy, medium, and challenging). All activities are interactive and provide immediate scoring.

I will throw this in with software, even though it is a site. Jay Is Games are the premier bloggers associated with casual games, many of which have mathematical and puzzle components. It's a good place to start to look for casual (and often educational!) "time-wasters."

Braingle is a site full of teasers and teaser activites for teacher use. This particular page has several examples of math brain teasers of various levels. Students can open different tools as they work to solve problems.

Provides many tools and printables- graphic organizers, Bingo card maker, puzzle maker, rubrics, lessonplans and more. Paid version available. [advertisements]

Hot Potatoes includes six applications: interactive multiple-choice, short-answer, jumbled-sentence, crossword, matching/ordering and gap-fill exercises to put on web. Hot Potatoes is free to publicly funded, non-profit, educational users who make their pages available on the web. Other users must pay for a licence.

Hot Potatoes kind of straddles the tool/software divide. It's a fun powerful program that I have mainly used for crossword puzzle creation, but it is able to do a lot more, like matching games and short answer quizzes. Good for testing Knowledge-level content.