Liveplan - LivePlan helps entrepreneurs and small-to-medium size business owners build dynamic business plans and track performance against their goals.
productboard - Beautiful and powerful product management.
Bizplan - Modern business planning for startups
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.
Cuttles.io - Develop your idea, write your plan & build your startup
ProductPlan - Cloud-based product roadmap software solution