UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.
Balto - Easy feedback with screenshot / videos for your beta apps
GetSatisfaction - Get Satisfaction is the leading customer engagement platform that helps companies build better relationships with their customers and prospects, through the best online customer community.
SessionStack - Record and replay web app issues. See them the way they happened to end users.
idea.informer - Idea Informer is a idea forum similar to uservoice or getsatisfaction.
Video Contact Forms by Typeform - Get 10x more personal with your site's visitors from Day 1