cranioscopical made me think that now the killer app is not just the browser, but the apps we can get from it. Think about what the killer app is that's taken us as far as we've gone — because people don't buy operating systems, they buy applications as
tamasd notes. The killer app that has driven this model is the internet itself. (Okay, so "the internet" is not an app, but the browser is right up there.)
When you get a collaborative application — which is the internet where that collaboration is essential to the value of the network — then in order for all the players on that network to play fair with each other it has to be open source technology, the kind that
jgpaiva uses with the
Eclipse IDE. The key is preventing any company from owning a protocol on the internet, because if that were to happen, then the internet will fail. It would be all over in a flash. The bulk of its value will disappear by virtue of corporate restriction and fees for various types of controlled access beyond what we suffer now.
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Otherwise, I'm choosing the
XYplorer File Manager as my killer/can't-start-the-day-without app.