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

PlaybookUX - PlaybookUX is an affordable user testing and interview software that recruits the right participants, schedules, transcribes and analyzes your research.

Doorbell.io - Collect in-app user feedback. Available on websites, iOS, and Android.

Survicate - Collect feedback on your website and find out more about your visitors.

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.

Usabilla Visual Survey - Gather feedback at any stage of the design process.