DevConverter converts your ebooks online. Amongst many others, we support EPUB, PDF, AZW and CBZ. No need to download any software to convert between various ebook formats!
TXTZ is a text archive file format creates a zip archive with text. It can also add images to the archive. It works with Calibre eBook software only till now. It supports Calibre because the TXTZ makes the eBook into one file. It supports Meta data using metadata.opf file.