Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Communifire - Enterprise Social Collaboration Software

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

LS Intranet - LS Intranet is a corporate intranet that facilitates multiple employees collaborating on projects, and working in synergy.

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

Unily - Unily is a cloud-based intranet solution designed by SharePoint consultancy BrightStarr.