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Image by YUYAO Mobile Software
PDF Reader Pro by YUYAO Mobile Software (Taiwan)
Despite the name of the app, users can read other files such as Word, Excel, Powerpoint and images. Users can take photos of documents to turn them into "scanned" PDF files as well as annotate the files.
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.