productboard - Beautiful and powerful product management.

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

ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.

Product Pains - Giving users a louder voice to help teams build better products.

ProductPlan - Cloud-based product roadmap software solution

Nolt - A fast & beautiful way to collect user feedback