Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.

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.

built.io - Idea to app in record time

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Clear Impact Scorecard - Clear Impact Scorecard is a grant management and performance software solution.

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.