Firefox addin for ePub Part of calibre can be used as just a reader (it might not be packaged easily for the user but can be done from the command line) Adobe

Firefox addin for ePub Part of calibre can be used as just a reader (it might not be packaged easily for the user but can be done from the command line) Adobe Digital Editions (this does also have a library and does try to make you add it when you stop reading) I suspect Fbreader might be OK - its earlier versions were but I have stopped using it after it added things. Plus the basic unzip the file and just look at the files with a web browser. These are just ones I have on my machine now.