Disaster response
The biggest international umbrella organizations are the Inter-Agency Standing Committee and the International Council for Voluntary Agencies.
Humanitarian OSM Team works to update and provide map in areas struck by disaster.

Disaster response technologies: 

Ad hoc infrastructure: A range of infrastructures could be restored ad hoc quickly after a disaster using technologies.

Communications: The Government Emergency Telecommunications Service supports federal, state, local and tribal government personnel, industry and non-governmental organizations during a crisis or emergency by providing emergency access and priority handling for local and long-distance calls over the public switched telephone network. There is a Nationwide Wireless Priority Service that allows a user to wait for cellular bandwidth to open.
Wireless mesh networks can be deployed rapidly to enable Internet connectivity, substitute failed mobile phone networks and emergency- and post-disaster communication – including for disaster response coordination and emergency calls. Mesh networks such as B.A.T.M.A.N. are often developed and deployed open-source by volunteer communities with little resources.

Electricity: Emergency power systems – such as mobile microgeneration units, mobile charging- and power supply-stations or specially designed or extended smart grids – could support important electrical systems on loss of normal power supply or restore power supply for small regions whose connections to the main power grid were cut off.

Transportation: The transportation infrastructure may have become unpassable due to a disaster, complicating logistics, evacuation and disaster response.
Technologies may allow for quick ad hoc sufficient restoration of the transportation network or substitutions of parts of it. Such include the rapid construction of stable bridges based on mobile lightweight and/or locally sourced materials or components, which militaries have been involved in.

Waste management: Disaster waste is often managed in an ad hoc manner. The waste generated by a disaster can overwhelm existing solid waste management facilities and affect other response activities. Depending on the type of disaster, its scope and recovery duration conventional waste may need to be managed in similar ways and both may be associated with the transportation network restoration.

Emergency accommodation: Emergency accommodation is sometimes considered to be an element of infrastructure. Temporary accommodation for people and animals after disasters is an issue. Sometimes existing private accommodation infrastructure and logistics are repurposed for the disaster response.

Water supply: Water supply, drainage and sewerage infrastructure, and the functioning of wastewater treatment plants may be disrupted by disasters.

Vaccination infrastructure: Long-term disaster response, as well as medical infrastructure local to disaster regions with increased health risk, may include vaccination infrastructure.

Response coordination websites: Volunteers, as well as other people involved in a disaster response such as locals and civil organizations like the Technische Hilfswerk, can be coordinated and coordinate with the help of websites and similar ICTs such as for preventing traffic jams, "disaster tourists" and other obstruction of the transportation network, for allocating different forms of help to locations in need, reporting missing persons and increasing efficiency. Such websites for specific individual affected regions have been set up after the 2021 European floods.

Emergency response systems: Smart Emergency Response System (SERS) prototype was built in the SmartAmerica Challenge 2013–2014, a United States government initiative. SERS has been created by a team of nine organizations led by MathWorks. The project was featured at the White House in June 2014 and described by Todd Park (U.S. Chief Technology Officer) as an exemplary achievement.
The SmartAmerica initiative challenges the participants to build cyber-physical systems as a glimpse of the future to save lives, create jobs, foster businesses, and improve the economy. SERS primarily saves lives. The system provides the survivors and the emergency personnel with information to locate and assist each other during a disaster. SERS allows to submit help requests to a MATLAB-based mission center connecting first responders, apps, search-and-rescue dogs, a 6-feet-tall humanoid, robots, drones, and autonomous aircraft and ground vehicles. The command and control center optimizes the available resources to serve every incoming requests and generates an action plan for the mission. The Wi-Fi network is created on the fly by the drones equipped with antennas. In addition, the autonomous rotorcrafts, planes, and ground vehicles are simulated with Simulink and visualized in a 3D environment (Google Earth) to unlock the ability to observe the operations on a mass scale.
The International Charter Space and Major Disasters provides for the charitable retasking of satellite assets, providing coverage from 15 space agencies, etc.  which is wide albeit contingent. It focuses on the beginning of the disaster cycle, when timely data is of the essence.
Digital technologies are increasingly being used in humanitarian action, they have shown to improve the health and recovery of populations affected by both natural and man-made disasters. They are used in humanitarian response to facilitate and coordinate aid in various stages including preparedness, response, and recovery from emergencies. More specifically, mobile health (mHealth), which is defined as the use of communication devices such as mobile phones for the purpose of health services information. Nowadays, millions of people use mobile phones as a means of daily communication and data transference, out of which 64% live in developing countries. One of the most important characteristics of disasters are the harms caused to infrastructures, accessibility issues, and an exponential  need of medical and emergency services. In such situations, the use of mobile phones for mHealth can be vital, especially when other communication infrastructures are hindered. In such conditions, the abundance of mobile technology in developing countries provide the opportunity to be harnessed for helping victims and vulnerable people.
Mobile health information technology platforms, in the acute phase of disaster response, create a common operational framework that improves disaster response by standardizing data acquisition, organizing information storage, and facilitating communication among medical staff. One of the challenges in disaster response is the need of pertinent, effective and continuous analysis of the situation and information in order to evaluate needs and resources. mHealth has been shown to provide effective disaster preparedness with real time collection of medical data as well as helping identify and create needs assessments during disasters. Using mobile technology in heath has set the stage for the dynamic organization of medical resources and promotion of patient care done through quick triage, patient tracking, and documentation storage and maintenance.
Managing an effective and influential response requires cooperation, which is also facilitated through mHealth. A retrospective study demonstrated that applying mHealth can lead to up to 15% decrease of unnecessary hospital transfers during disasters. In addition, they provide field hospital administrators with real-time census information essential for planning, resource allocation, inter-facility patient transfers, and inter-agency collaboration. mHealth technology systems can improve post-operative care and patient handoffs between volunteer providers. Data entry with mobile devices is now widely used to facilitate the registration of displaced individuals, to conduct surveys, identify those in need of assistance, and to capture data on issues such as food security, vaccination rates, and mortality.
Above all, mHealth can harness the power of information to improve patient outcomes. Efforts led by the Harvard Humanitarian Initiative and Operational Medicine Institute during the Haiti earthquake resulted in the creation of a web-based mHealth system that created a patient log of 617 unique entries used by on-the-ground medical providers and field hospital administrators. This helped facilitate provider triage, improve provider handoffs, and track vulnerable populations such as unaccompanied minors, pregnant women, traumatic orthopedic injuries and specified infectious diseases. Also, during the Haiti earthquake, the International Red Crescent sent more than 45 million SMSs to Viole mobile phone users.  This resulted in  95% of the receiver reporting they had gained useful information, and out of these 90% reported the SMS helped in their preparedness.

Problematic individual and collective responses: Previous experiences with false alarms cause some people to ignore legitimate danger signals, such as a fire alarm.
Amanda Ripley points out that (contrary to many portrayals in movies) among the general public in fires and large-scale disasters, there is a remarkable lack of panic and sometimes dangerous denial of, lack of reaction to, or rationalization of warning signs that should be obvious. She says that this is often attributed to local or national character, but appears to be universal, and is typically followed by consultations with nearby people when the signals finally get enough attention. Disaster survivors advocate training everyone to recognize warning signs and practice responding.
A study published in 2020 showed that social networks can function poorly as pathways for inconvenient truths that people would rather ignore and that the interplay between communication and action may depend on the structure of social networks. It also showed that communication networks suppress necessary "evacuations" in test-scenarios because of spontaneous and diffuse emergence of false reassurance when compared to groups of isolated individuals and that larger networks with a smaller proportion of informed subjects suffered more damage due to human-caused misinformation. Following disaster, collective processing of emotions leads to greater resilience and community engagement.

Impacts of disasters: 

On men and women: In the immediate aftermath of a disaster, an affected population has a number of needs. In disaster response relief, many actors tend to focus on addressing the most immediate needs first. For example, the United Nations Office for the Coordination of Humanitarian Affairs (OCHA) emphasizes that:

response efforts will focus on the immediate provision of quality life-saving humanitarian supplies, including ready-to-eat rations and food baskets, basic relief items for the most vulnerable households, including light hygiene and dignity kits, and a series of initial – and largely mobile - emergency protection interventions. Delivery of basic services will be supported through the reinforcement of available service providers relating to sectors including health, WASH, shelter, protection and education in the areas hosting those newly displaced.
These priorities are more than just addressing basic needs, as they represent shared needs between men and women.