Asana

I've used Asana for a few years and I really love the ease of use. It's simple for new team members to jump in and get involved with minimal training. The ability to toggle between lists, boards, and calendar views is great! Their support options are pretty limited, and some features like automated processes are unavailable until you upgrade to the Business tier. Overall, it's the best task management tool I've found for managing teams - big or small.