Note: I responded with wrong info to this post. was reading something else at the same time, and mixed up the two. That info is still below, because it is still useful to some people. Just hit the spoiler button.
And I'd just say use Calibre, but set things up to where when you open an ebook, it just opens up in the Viewer, and bypass the library. You may have to configure it via the ebook-viewer command, which you have to do some extra stuff for OSX (mentioned below).
Spoiler:
Calibre can be used to convert without needing to import to the library, from the commandline.
Quote:
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On OS X you have to go to Preferences->Advanced->Miscellaneous and click install command line tools to make the command line tools available. On other platforms, just start a terminal and type the command.
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Once you've done that, there will be the ebook-convert command.
Now, if you're comfortable with the commandline, you can just use that, OR, use something like
DropScript which will let you create a nice app that would let you drag and drop a file onto it, and automatically execute a command from the commandline. That way, you can have a some things on your desktop, or on the dock (remember, the Dock can also have folders that can pop up with a little menu, akin to how the windows start button works), and you just drop the ebooks onto them and get it automatically converted to the format you wanted. Now, the caveat to this is that you have to a separate one for every output. So, if you use epub and rtf, you'll need one for each.