ClassTools is a free site that allows you to create free educational games, activities, quizzes, and more. You can host them on your own website or blog and there is no sign up required.
They also have some great templates, including Fakebook (create fake Facebook pages), Arcade game generator, QR code game generator and even have classroom timers, and a random name picker.
There are video tutorials on how to use the available tools also.
There are some great tools here for teachers to use to make some great activities for students. You could also have students use the tools to create projects for class.
NOTE: They are Flash based.