Individuals, groups, and organizations store useful information, such as a list of tasks to complete or a list of names and addresses as well as provide an appointment calendar and a place to take notes.

The correct answer here is Personal information managers.

Explanation:

PIM or personal information manager is a software application which is used by individual, groups and organizations to manage contacts, calendar, reminders, alerts, notes , making appointments, project management etc through its PIM tools and these tools can vary according to the need. So it can be said that this personal information manager acts as a personal organizer.

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