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.
Habit List - Create good habits and break bad ones with the app that keeps you focused.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Momentum - Agile goal and performance management
GTDNext - About Us.
everyday.app - Every day, it gets a little easier. But you gotta do it every day, that's the hard part.