From Anthemion Software:
With Jutoh Portable create ebooks in popular formats that you can sell on many ebook sites, including Amazon's Kindle and Apple's iBooks. Create your project in seconds from existing files using the New Project Wizard; or create your book from scratch using the built-in styled text editor. Select a book cover design from its templates, or create your own with the built-in cover designer. Jutoh lets you start creating your ebooks, but has plenty of features and configuration for more advanced use, including support for contents, index, and end notes pages.