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.
LS Intranet - LS Intranet is a corporate intranet that facilitates multiple employees collaborating on projects, and working in synergy.
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
Unily - Unily is a cloud-based intranet solution designed by SharePoint consultancy BrightStarr.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.