Nifty - Manage projects, work, and communications in one place.
Nolt - A fast & beautiful way to collect user feedback
Intercom on Product Management - The ultimate resource for aspiring product managers
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
productboard - Beautiful and powerful product management.
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.