Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Tatsu - Standup meetings for remote teams.
WorkPatterns - The modern manager's toolkit: 1:1s, feedback, & recognition
Any.DO - The #1 task management app used by over 11 million people globally, Any.do is your free mobile and online task manager for Android, iPhone, Web and more.
SlimPlanner - Team scheduling, resource planning, task management