This program is free and seems to be able to read a lot of different file types. It's available for Windows and Mac.
https://www.lexcycle.com/desktop
And here's a Firefox plugin that works similarly.
https://addons.mozilla.org/en-US/firefox/addon/45281
Reading epub and other book formats
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major.tom
- Macho Business Donkey Wrestler
- Posts: 1970
- Joined: Sun Jan 21, 2007 7:07 pm
- Location: BC, Canada
A popular open-source program for converting between eBook formats is Calibre. It works better converting between the more basic formats (epub/mobi/opf) than the more proprietary ones like PDF.