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Two Due is a To Do List manager that does more than most. Some of its special features are: recurring To Do items, so that they can be scheduled to occur on a regular basis; sorting and selection by multiple fields; multiple files with remembered viewing options for each; extra fields for each To Do item, such as a multi-line Description, Outcome, Sequence and Web Page; automatic Web Publishing; plus multiple category levels.
The latest release includes multiple levels of categories, so that you can have a main category and as many sub-categories as necessary for each item on your To Do list. The new Tree Tab lets you look at your list by category, with separate groups for each category, and lets you expand or collapse each group so that you can focus on one or more categories at a time.