SightMill - SightMill: Innovative customer experience platform that helps you get feedback from your customers. SightMill lets you quickly and easily setup Net Promoter Score surveys via email, on your website, by SMS and at events.

Zonka Feedback - Top feedback app designed to collect customer feedback on iPad & Android tablets, Online Surveys on Website, Mobile, Email & SMS. Track NPS & Other Metrics.

piHappiness - A complete customer feedback app offering real-time feedback via emoticons. Our Custom feedback software captures core human insights in mere 30 seconds.

KeySurvey - KeySurvey provides survey and questionnaire tools.

SurveyNuts - Easy & beautiful survey maker.

FeedbackServer - asp.net survey software Web based and open source software, for purchase or hosted, written in ASP.NET for Nsurvey