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- sigil http://code.google.com/p/sigil/
- calibre http://calibre-ebook.com/ (can import/export from various formats, including pdf > ebook).
- LibreOffice Writer2ePub http://extensions.services.openoffice.org/en/project/Writer2ePub
- FBTools http://www.fbtools.org/
Collaborative ebook editor: