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

Locale - Locale helps content owners and translators work together, so Rails developers are free to write more code

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

Interstate - Manage your projects using easy and powerful roadmaps.

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