Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
piHappiness - A complete customer feedback app offering real-time feedback via emoticons. Our Custom feedback software captures core human insights in mere 30 seconds.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
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.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
KeySurvey - KeySurvey provides survey and questionnaire tools.