Do we have any optware package(s) similar to the calibre e-book server on Windows/linux ?
More info here - calibre-ebook.com/about
Check out http://www.optware-project.org. That is the official source of the optware packages. From a quick 2 minute search it sounds like a Calibre server is just a web server, so theoretically it should be possible as optware has web server packages. The question would be whether the Calibre server can be made to run on a router.
While there is indeed a web server component to Calibre, that's only a small part of it. The important part is the conversion part of the program.