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.
This venerable product is no longer being updated. It remains viable for those willing to dig in and tweak things a bit.
Via Gust MEES