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Image by Shibuya Masanori
TaskBook :To-Do list organizer by Shibuya Masanori (Japan)
Users can create to-do list, tag the tasks into different categories, and drag and drop different tasks.
Image by YunaSoft
Awesome Calendar(+Google Task/Diary) by Yunasoft (South Korea)
Price: US$2.99 (promo price. Normal price US$4.99)
Users not satisfied with the built-in Calendar can check out this app which allows you to create a to-do list, write notes, check the weather, send e-mail and so on.
Image by Hancom
Hancom Office Hanword by Hanword (South Korea)
Another word editing app for documents with the included capability to edit *.hwp files (Hangul document) based on Hancom Office 2010.