[HereBeBeasties]

fibery.io - it is excellent. You need to configure it, although it has various templates to get you going out of the box, including sprint-based development.

The nice thing about it is that you can add whatever you like, however you like. Want components with default owners for tasks? Want milestones? Want stakeholders? Want sign-off reviewers? Want to integrate with existing tools like Linear or Notion or JIRA or even email inboxes or Slack messages? Add entities for Incidents, that automatically make a dedicated Slack channel when you create them?

Want proper 1:1 or 1:manu or many:many links between Tasks and Milestones and Sprints and Incidents and Teams and Components and whatever?

Want single assignees? Or multiple ones?

Want flexible custom reports on all of it?

Or just want a simple flat Todo list, that can evolve later to fit your needs?

Stop having the tools dictate to you how you work and instead set it up how your company actually wants to work. That's Fibery.

(I am not connected to the company, just a very happy user.)