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.

Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.

Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

Meetings Are Dead - People spend most of their time on meetings, where they are not needed, being unproductive.With MAD(Meetings Are Dead) you can assign real tasks and problems to relevant people, while others can continue their work.

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

Riter - Project management & team collaboration tool