Existing Software: From G2.com Rapid Reach: Can send alerts regarding emergencies from user to a group of recipients. Aimed at businesses and limited to 50,000 recipients. Evenbridge: Essentially same as above All software that I found here works via servers that send a message from users to a set list of recipients. From Play Store Alertable: Alerts based on weather emergencies. Limited to weather and only works in Canada. Emergency Alert: Takes info from open news apps. Notifications are triggered by detecting emergencies in other news based applications. Only works with apps that are open at the same time. Logistics: Open-Source Software: Kuzzle Free backend for web and mobile development. Provides geofencing- Useful for location-tailored alerts Tile 38 Geofencing, automated event and notification software. User accounts, UI: Users could have an account and post alerts to a specific geofenced area. T...