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Survey Monkey - Create and publish online surveys in minutes, and view results graphically and in real time. SurveyMonkey provides free online questionnaire and survey software.
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Google Forms - Simple web forms from Google.
GPGMail - GPGMail is an open source plugin for Apple Mail.
Qualtrics - Qualtrics is the most trusted research platform, helping brands make crucial business decisions. From surveys to insights to action.