MailChimp - MailChimp is the best way to design, send, and share email newsletters.
KeySurvey - KeySurvey provides survey and questionnaire tools.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
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.
UniSender - Email Marketing Service Provider
piHappiness - A complete customer feedback app offering real-time feedback via emoticons. Our Custom feedback software captures core human insights in mere 30 seconds.