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.

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.

GetSatisfaction - Get Satisfaction is the leading customer engagement platform that helps companies build better relationships with their customers and prospects, through the best online customer community.

ProductPlan - Cloud-based product roadmap software solution

idea.informer - Idea Informer is a idea forum similar to uservoice or getsatisfaction.