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.
StoriesOnBoard - StoriesOnBoard helps agile teams build better products faster. The built-in guide helps you collect and prioritize ideas, understand user requirements, gather customer feedback, and validate feature ideas with internal & external stakeholders.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Roadmap Space - Customer feedback & product management software for SaaS teams.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.