Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Slack - A messaging app for teams who see through the Earth!
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
MS SharePoint - Share, organize, and discover information with Microsoft SharePoint. Learn about SharePoint Online, OneDrive for Business, and Apps for SharePoint
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.
Jostle - A new kind of employee intranet that drives engagement & workplace culture. Achieves social participation in work relevant way. Participation rates are over 85%.