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
Promoter.io - Promoter is designed to capture actionable and accurate customer feedback that reduces churn and drives growth
Survicate - Collect feedback on your website and find out more about your visitors.
Delighted - The fastest and easiest way to gather actionable feedback from your customers
Heeduser - Heeduser is the customer engagement platform that helps companies build better relationships with their customers and prospects, through the better online customer community
Wootric - Wootric is software that allows apps and websites to take customer satisfaction surveys so that you can properly gauge the popularity and success of your app through the eyes of the people using it. Read more about Wootric.