You mentioned in another thread (Java rss2book in the developer's corner) about possibly releasing your C# code to serve as a basis for Java apps. While that would certainly be helpful, I think it would be possible to get your rss2book app to run under Linux using mono. I've tried already, but mono dies on some unimplemented features of Windows.Forms. It might be possible to rework aspects to avoid using Windows.Forms features that are not implemented in mono, or share the backend and write another front end using Gtk#. Never used .NET myself, but I'd definitely spend some time trying to get it working if the code was available!