shipit

Very simple and useful tool for product managers

I have been using shipit for over a year now, and the reason I chose this over other tools is the simplicity. Compared to bigger names there is less functionality, shipit is less flexible (i.e. you can only use quarterly-based approach with sprints), but this is also where the tool wins. You get the essentials which are enough to not get in your way. And their support is amazing!