Through Google Docs Demos you can try out the presentation, spreadsheet, drawing, and document tools of Google Docs without signing into a Google Account. Getting everyone in a group signed-up for an account can be time-consuming. If you're trying to introduce new users to Google Docs, Google Docs Demos could be a good way to get everyone trying the tools as quickly as possible.
Quipper is a free tool for creating quizzes to be taken on iPhones, on Android tablets, and on Android phones. Quipper quizzes are multiple choice activities created by the community of users. As a Quipper quiz creator you can make your quizzes public or private.
When you create a quiz on Quipper you can include explanations for each answer. To create a quiz you can write each question and answer choice manually or you can import a spreadsheet of questions and answers. If you decide to try Quipper, keep in mind that quiz publishing isn't instantaneous.