Mobile Apps

Multi-Hazards

Natural Disaster Monitor - (dominoc925)

Disaster Alert - (Pacific Disaster Center) 

Federal Emergency Management Agency FEMA - (FEMA)

Geohazard-Natural Hazards - (GFZ German Research Centre for Geosciences)

Disaster Management (MCGM) - Disaster Management Unit (MCGM)

GDAC - (SAR CZ)

Volcanoes & Earthquakes - (VolcanoDiscovery)

Hurricanes/Tornadoes

Storm Radar: Weather Map - (The Weather Channel)

Intellicast Weather - (WSI Corp)

WJXT Hurricane Tracker - (Graham Media Group)

WDSU Hurricane Central - (HTVMA Solutions Inc)

Hurricane Tracker - (HTVMA Solutions Inc)

NOAA - (Kelly Technology Inc.)

Hurricane Software - (HurricaneSoftware.com)

Hurricane - (American Red Cross)

Tornado - (American Red Cross)

Earthquakes

GeoNet Quake - (GeoNet)

USGS Earthquake Data - (tsRogers)

ELRTS Reporter - (ELERTS Corporation)

MyShake - (UC Berkeley Seismological Laboratory)

Earthquake Network - Realtime Alerts (Francesco Finazzi)

Shakealert LA - (City of Los Angeles)

Volcanoes & Earthquakes - (VolcanoDiscovery)

eQuake – Earthquake Alerts - (Zizmos)

Earthquake Alert! - (Josh Clemm)

Info BMKG - (Badan Meteorologi, Klimatologi, dan GeofisikaWeather) Official App; 

Note this is in Indonesian

Tsunamis

TSP Indonesia - (TSP Indonesia (BMKG))

HawaiiTsunami Info Service - (NOAA Office for Coastal Management)

Tsunami Early Warning - (ISM Labs)

Volcanoes

myVolcano - (British Geological Survey)

Volcano Report - (WebEndemics)

Volcanoes: Map, Alerts, Ash Clouds & News - (Slava Barouline)

Volcano CCTV - (studika)

Volcanoes & Earthquakes - (VolcanoDiscovery)

Flood

Flood Alert - (CH2M HILL) (UK)

Flood - (American Red Cross) 

Red Cross Apps

Emergency - (British Red Cross)

Emergency - (American Red Cross)

Other Apps:

JESIP - (EBY Design Ltd)

Prometheus IMT: METHANE - (Prometheus Delta Tech)

Official Disaster Games

Tanah - (Opendream – created with UNESCO). Available in different languages

Are your favourite apps missing from this list? Let me know and I will add them to the list!