Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Effortless - Stay focused and beat procrastination on your Mac.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Memory by Timely - An intelligent timeline of everything you did in a day.
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.