Vabotu - More than slack. More than Trello. FREE.

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

Attentiv - Simple collaboration with upvotes, polls and anonymity

Workflowy - A better way to organize your mind.

Tara AI - Define, plan & track mission-critical product updates, in one place.

Remember The Milk - Remember The Milk is a task and time management application for mobile devices.