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.

Whisper.sh - Whisper is the best place to express yourself online. Connect with likeminded individuals and discover the unseen world around you.

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

Sayat - Sayat app is all about getting anonymous and honest feedback.

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.

Sarahah - Sarahah is a Social Networking Application for providing anonymous feedback launched in 2016 and available to use on iOS and Android platforms.