Wikipedia
Nixle
Nixle offers free and paid notification services for local police departments, county emergency management offices, municipal governments and their agencies. The Nixle service allows government agencies to send messages to local residents via phone, email and web. Information is delivered almost instantly. Nixle serves government agencies and organizations in all 50 states. By June 1, 2014 over 7,100 agencies and over 2,000,000 subscribers were registered to use the Nixle service.
Nixle was founded in San Francisco, CA in 2007 by Firas Emachah and Craig Mitnick. In January 2015, the company's strategic assets were acquired by Everbridge.