Odoo - An all-integrated business app suite to unleash your growth potential.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Infor ERP - An ERP suite for the manufacturing & distribution industries
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
Adempiere - ADempiere is a commons-based peer-production of Open Source ERP Applications.
Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.