| Search and Rescue | RNLI | Volunteer lifeboat service for UK and Ireland; entirely donor-funded for 200+ years | rnli.org | @RNLI |
| Search and Rescue | Civil Air Patrol | US volunteer aviation organization; search and rescue, disaster relief, counterdrug operations | gocivilairpatrol.com | @CivilAirPatrol |
| Disaster Relief | Neighborhood Emergency Response Team | Volunteer emergency response | sfgov.org/agency/nert-neighborhood-emergen... | @SFFDNERT |
| Disaster Relief | Doctors Without Borders | Medical non-profit operating in conflict zones and disaster areas | doctorswithoutborders.org | @MSFUSA |
| Disaster Relief | American Red Cross | Oldest and largest US disaster relief organization; volunteer-staffed; responds to ~70,000 disasters per year | redcross.org | @RedCross |
| Disaster Relief | Team Rubicon | Veteran-led nonprofit deploying skilled volunteers for disaster response and reconstruction operations globally. | teamrubiconusa.org | @TeamRubicon |
| Medical Aid | Direct Relief | Humanitarian aid organization delivering emergency medical supplies to disaster-affected communities and clinics worldwide. | directrelief.org | @DirectRelief |
| Disaster Relief | Samaritan's Purse | Christian humanitarian organization delivering emergency aid and disaster relief to victims of war, disease, disaster, and poverty. | samaritanspurse.org | @SamaritansPurse |