Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Effortless - Stay focused and beat procrastination on your Mac.
EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Memory by Timely - An intelligent timeline of everything you did in a day.