Jira. In the Software-as-a-Service world, it’s often the tool of choice by Product teams to track issues, by breaking everything down into stories.
It’s a horrible, slow, janky mess. The interface is confusing and poorly laid out, you can easily have too many options all over the place, and how its even used can vary dramatically from one company to another.
Salesforce is also trash for very similar reasons. How Sales people around the world all vouched for this thing is beyond me.