Dropbox

SDK iOS Dropbox : http://blog.0x82.com/2011/04/12/dropbox-sdk-module-for-titanium-mobile-ios
SDK Android Dropbox : https://marketplace.appcelerator.com/apps/1292
Dropbox API : https://www.dropbox.com/developers
Login into Dropbox: http://www.youtube.com/watch?v=rK3DZV_ThvM