Nifty - Manage projects, work, and communications in one place.
productboard - Beautiful and powerful product management.
Flow - Stop managing projects from your inbox.
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.
Workflow86 - All-in-one platform for automating complex workflows and business operations
ProductPlan - Cloud-based product roadmap software solution