productboard - Beautiful and powerful product management.
Aha! Business Model Builder - Create the perfect strategy for your product roadmap
ProductPlan - Cloud-based product roadmap software solution
ConTEXT - ConTEXT is a small, fast, powerful and highly compact text editor for the Windows operating 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.
Linear Release Roadmaps - Next level for builders