Flux - Application Architecture for Building User Interfaces
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Spaces by Google - Small group sharing for everything in life
Todoist 10 for iOS - A completely new Todoist for iOS
TickTick - TickTickis a cross-platform to-do list app & task manager helps you to get all things done and make life well organized.
Prio - Beautiful task lists and reminders