Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Info Select - Info Select is a Personal Information Manager that organizes Internet data, notes, to-do's...
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
C-Organizer - C-Organizer is a robust software tool designed for the professional manager that permits them to organize business activities altogether.
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.
MSD Organizer - MSD Organizer one of the best software providing you a personalized experience with the complete visibility of the personal and professional manager.