Calibre is a free and open source e-book library management application developed by users of e-books for users of e-books.
eCub is a cross-platform tool for creating EPUB and MobiPocket books. EPUB is become a popular e-book standard and is open and free for all to implement. EPUB files can be read by MobiPocket, Adobe Digital Editions, FBReader, Stanza, the Sony Reader, and many other readers and applications. MobiPocket books can be read on desktop platforms, mobile platforms and the Amazon Kindle e-book reader.
Open Office eBook extension
Atlantis Word Processor
BookCreator Tool is an eBook creator tool. This tool is an MS Word template with VBA code. The tool is designed to optimize and simplifying the book creation process.
Since this tool is an MS Word template, one can take advantage of all of the editing rich features provided by MS Word for editing and creating an eBook. In addition the template provides a set of editing tools, formatting features, and Styles to simplify the eBook creation process.
DeskTop Author is an electronic publishing software that allows you to quickly and easily create 3d page turning electronic publications such as eBooks, eCatalogs, eBrochures, ePresentations, photo albums and much more.
EBooksWriter is perfect for beginners, yet contains many high powered features. You can create fancy pages in minutes, because you don’t need to learn all available functions, nor all the dialogs to start taking advantage of its power.
Hot Lava Software
ePuper is a freeware tool for authoring epub files from web sources for windows.
Basically ePuper was written to bring online newspapers to an offline ebook reader. ePuper has an interface you can create plugins for that converts your favourite web page to an epub file.