UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system
Survey Monkey - Create and publish online surveys in minutes, and view results graphically and in real time. SurveyMonkey provides free online questionnaire and survey software.
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.
LimeSurvey - LimeSurvey: the Online-Umfrage Tool - Open-Source Suryeys
Survicate - Collect feedback on your website and find out more about your visitors.
Google Forms - Simple web forms from Google.