Canny - Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.
Issuetrak - Issue tracking software for help desk and customer service
RealEye - Online Research Platform with Webcam Eye-Tracking.
Deskun - Deskun is a Help Desk system inside Gmail. It enables you to support customers directly from your mailbox, manage projects, and use free features for Gmail.
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
Kapdesk - Kapdesk offers support teams with a helpdesk software to streamline support tasks.