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@iamosam:
Re monopoly:
1. Calibre is a product ("good or service" in economic terms), not a provider of a product. There is no definition of monopoly that I know of where the good or service is the monopoly. It is the provider of the good or service that is the monopolist, having the monopoly on the good or service being provided.
2. Given the above, one must argue that Kovid is a monopolist. That would be fallacious, because to be a monopolist he must have exclusive control over the product (amongst other things), and he does not because he voluntarily gave it away. Anyone who wants to "produce" and "distribute" the "calibre product" is free to do so. Further, such a person can distribute it with or without modification and with or without the calibre name, meaning that the only barriers to entry are getting known and accepting the GPL license.
3. Calibre is not alone in the ebook management market. Some competing products were provided above. I suspect that neither Apple nor Amazon would agree that calibre has a monopoly on ebook management software, and their millions of users who have no idea that calibre exists would agree.
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