Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
UpNote - A beautiful and clean cross-platform app for notes organizer
Any.DO - The #1 task management app used by over 11 million people globally, Any.do is your free mobile and online task manager for Android, iPhone, Web and more.
Notesnook - Notesnook is a simple and private note taking app that keeps your notes organized and synced on your phone, tablet and computer.
Microsoft To-Do - Task management tool
todoZero - A powerful to-do and note app for busy people.