Kreeo VS EssentialPIM

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!

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.

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

Jostle - A new kind of employee intranet that drives engagement & workplace culture. Achieves social participation in work relevant way. Participation rates are over 85%.

Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.