ThoughtFarmer VS EssentialPIM

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

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

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

Simpplr - Simpplr’s social intranet offers powerful tools that ensure every employee is aligned and working toward common goals.

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