Motion Firefox - All-in-one time management tool in Firefox

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

Taskable - Using multiple work apps leads to tons of context switching, breaking flow and killing productivity.

Taskful - Deadlines, meet your match.

Task Muncher - Task Muncher is a cross-platform and web-based application that is designed to organize and keep the track of everything and focus on munching the weekly tasks.

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