You could combine other open source tools, e.g.:
DOC: use Open Office/AbiWord to convert to HTML and Sigil or eCub to convert HTML to ePub
PDF: use AbiWord or pdftohtml/pdfreflow to convert to HTML and proceed as above
(eCub isn't open source, but it is free-as-in-beer and available for linux, which I gather you use from your avatar...)
There are some ePub export plugins for OpenOffice; you'll find two mentioned in sticky posts in this forum
Apart from calibre, I don't know of many programs that will work with lit... don't have a lot of experience with it.
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