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.

The ToDon't List - A to-do list for avoiding the things you shouldn't be doing

Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.

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

Corrello - Dashboards for agile teams using Trello