I missed this when it happened in June. Hot Potatoes, the Moodle-compatible quiz-making application, is now free to everyone. It used to be free to public schools only. The application allows one to create a quiz using a desktop application and then upload it to a web application such as Moodle. Desktop application interfaces have traditionally been easier to use and more powerful than web application interfaces.
The Hot Potatoes suite includes six applications, enabling you to create interactive multiple-choice, short-answer, jumbled-sentence, crossword, matching/ordering and gap-fill exercises for the World Wide Web. Hot Potatoes is freeware, and you may use it for any purpose or project you like. It is not open-source.