ePubHub is an open source program written in .Net which only runs on Windows. It is designed to manage the ePub container files.
ePubHub is an ePub assembly tool - the last part of an ebook workflow. It is intended to be a very technical program, giving access to the fundamental parts of the ePub format while also working in a language that is familiar to books (chapters, paragraphs, etc.).
This is a preliminary release and has many limitations.