Find My iPhone - Apple Inc. Locate your iPhone or iPad, lock or wipe it remotely, and more.
The Elements: A Visual Exploration - Element Collection, Inc
.epub Simplified
Zipped Website Container/Organizer for the eReader
If the book you are writing were a web site, it would have parts like:
- Words
- Pictures
- Fonts
- Links
So ..., "yourbook.epub" could be opened in an Apple iPad, for instance, as a book container with all those parts inside (and maybe more).
Check out the Adobe Video on Publishing EPUB: 
The Sigil WYSIWYG ePub Editor
The Sigil WYSIWYG ePub editor is a free software and download for Mac, Windows, and Linux. Every author or publisher should use Sigil to finish the book submission in the ePub format.
Sigil is a true .epub editor in that you are seeing the .epub structure as you work with the document. That's unique!
I would compare the look and feel of Sigil to the advanced and split window coding approach that programs like DreamWeaver use for developing web sites.
Sigil is, at this point, my .epub checking and finishing tool of choice.
Apex Toll
The Place of Answers
Also available on:
- Kindle: $3.99
- Paperback Book: $12.99
(Eligible for Free Super-Saver Shipping)
Every quality word processor should have an 'Export' or 'Save As' feature for the .epub file extension and structure.
Apple's iWork Pages software is ideally suited to this export feature evolution because it already works well with the XML code that .epub uses.
MS-Word has an excuse for being slow to adopt the Export as EPUB feature because of their .docx court case setback.
More in the future ...