Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Binery.co - BINERY powers the financial back office for startups and small businesses. We provide a real-time and seamless bookkeeping experience for growing businesses in Asia and beyond!
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
WeekToDo - Free and Open Source Minimalist Weekly Planner and To-Do list App Focused on Privacy
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.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.