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.
Confluence - Confluence is content collaboration software that changes how modern teams work
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Sharepoint Online - SharePoint is a secure place to store, organize, share, and access information from almost any device.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.