WebAsk - Learn to read the minds of your customers, co-workers and followers with this fully-customizable and light-weight toolkit for collecting and processing user feedback.

Frill - A better way to collect customer feedback

Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.

Prowess - The simplest way to collect and leverage product feedback

Twitterfeedback.app - Discover user feedback from Twitter for free

Canny - Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.