Planning Poker by Standuply - Asynchronous planning poker via Slack task-based surveys
productboard - Beautiful and powerful product management.
Sprint Poker by Parabol - Remotely bring planning poker to life
Aha - Aha! is the new way to create visual product roadmaps. Web-based product management tools and roadmapping software for agile product managers.
Planning Poker for teams - Estimation for agile teams
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.