Don't know if it is the most popular tool, but I can definitely recommend ProductBoard - https://www.productboard.com/ https://www.productboard.com/ It is beau

Don't know if it is the most popular tool, but I can definitely recommend ProductBoard - https://www.productboard.com/ https://www.productboard.com/ It is beautiful app with many integrations(Zendesk, Jira, Trelo, Slack, etc) and many features which helps you to conduct research, prioritize what to build next, communicate plans and progress. Hubert, the CEO of PB, is also very active on Medium where he writes about product management - https://medium.com/@hpalan https://medium.com/@hpalan