It goes under many names but I'm referring here to a tool that helps us build and monitor plans for our development.
Jira Advanced Roadmap (old name: Portfolio) - a great tool to make plans, automated schedules, clean gant chart, and many more.
My review
Jira Structures - interesting tool in the case of very complex Jira structures (multilevel child items).
Asana
Monday.com
Productboard
Microsoft Project
Trello Timeline
Jira
Trello
Plan IT Poker
Microsoft To Do (available on the web but also as a desktop or android app)
Jira Assistant plugin - helps managing Jira, especially in terms of hour and estimations managment