TaskPaper - Plain text to-do lists for Mac
Priorities - A todo app for today and tomorrow only
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
N-hance.io - Task prioritization tool, inspired by the 7 HABITS book, the #1 Most Influential Business Book of the 20th Century.
Microsoft To-Do - Task management tool
Time 2 - Stay focused and crush procrastination