Communifire - Enterprise Social Collaboration Software
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.
Bonzai Intranet - Bonzai is an intranet platform with flexible pre-built features for SharePoint and Office 365.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
hub - The Hub is a versatile intranet portal and collaboration solution that boosts employee engagement and productivity in a digital workplace.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.