Communifire - Enterprise Social Collaboration Software
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
DigitalChalk - Online Training Software and Learning Management System (LMS)
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Workplace by Facebook - Connect everyone in your company and turn ideas into action.
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.