Google Calendar - Spend less time managing your day & more time enjoying it
Plan - Plan is a better way to organize.
Tweek.so - A concise and simple weekly to do list calendar app to organize your tasks online. A lightweight weekly planner to maintain your focus and boost productivity week over week.
Kin Calendar - The simple and connected calendar
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Kin - Kin is money for the digital world. It is used to generate value through a shared, decentralized cryptocurrency in a digital ecosystem of apps and their users.