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I've been going through some of my old books to convert everything to HTML and/or epub as a long term storage format, and found that I still have a lot of leftover files from when I read mostly on my Palm devices.

Unfortunately, I went through a lot of formats back in the day, including PalmDOC, Peanut/pml, iSilo, Plucker and Mobipocket.

Is there any all in one tool that will let me turn these back into text and/or HTML? Or do I need to collect a bunch of different tools and just keep trying them separately?

I know Calibre can probably handle this, but I'd like to get the output into a more "raw" state than I've seen Calibre produce (though I haven't used it in the last three or four years).