Probably the simplest and best looking issue-tracking you will find out there. With many power-ups to suit your workflow and needs.
You decide how to call your issues? tasks? or incidents? and you build your pipeline so that your team could easily take the actions necessary. Keep it simple as closed and open issues or go wild and build a bigger pipeline. Each pipe can provide your team with multiple actions for the selected issue.
For full list of features check the features page
Break tasks in smaller subtasks by creating checklists inside your card
Get anyone's attention by mentioning him in a comment inside the card
Track time on tasks or log it manually
Set due dates and never miss a deadline
Add more context to your cards and todos
Identify stoppers and blocking tasks