That's an awkward one. Much as it would be nice to be on other platforms, I really want to build an app that I want to use daily and has a great user experience. I wouldn't be so keen on building for a platform I don't use. The JSON feed format is pretty basic, so maybe someone else could provide a Linux client with similar features.
Wouldn't alternative implementations be at odds with your stated monetization plan? I mean, it'd make sense if you were running the platform, but isn't this just a bunch of JSON files in a shared Dropbox folder?
