PlaybookUX - PlaybookUX is an affordable user testing and interview software that recruits the right participants, schedules, transcribes and analyzes your research.
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.
Survicate - Collect feedback on your website and find out more about your visitors.
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.
Usabilla Visual Survey - Gather feedback at any stage of the design process.
idea.informer - Idea Informer is a idea forum similar to uservoice or getsatisfaction.