Crazily enough, you may be able to do all of this in an HTML 5 / Javascript app running on a server, including the offline / syncing components. This assumes y

Crazily enough, you may be able to do all of this in an HTML 5 / Javascript app running on a server, including the offline / syncing components. This assumes you can get users running a relatively recent browser. https://developer.mozilla.org/en-US/docs/Web/HTML/Using_the_application_cache https://developer.mozilla.org/en-US/docs/Web/HTML/Using_the_... Of course, you may have other requirements not listed here that necessitate a more native environment.