WiziApp is a free WordPress plugin that allows you to publish your App as a native App to the App Store and Google Play Market. You can easily create your own free HTML5 mobile Apps for iPhone, Android and WP8 users.
Make your BuddyPress network mobile optimized. BuddyMobile is free Mobile theme for BuddyPress sites. It is optimized for viewing on iPhone, iPod touch and also works on Android and some Blackberry devices.