Microsoft released free apps for Android, iOS, and Windows Phone to request help or offer help (in a variety of ways).
Download a Lifeline: New Disaster Response App Launches
The HelpBridge mobile application simplifies the process of notifying loved ones by simultaneously sending an e-mail and SMS to the communities you select & posting a message to your Facebook wall. You can even include your GPS coordinates so that message recipients will know where you are and the circumstances surrounding you.
The apps are named HelpBridge.