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Harvey has devastated communities across southeast Texas and Louisiana since slamming the coastline late Friday and making landfall again Wednesday — ripping apart homes, deluging highways and knocking out power for hundreds of thousands.

As rescuers scramble to save people from catastrophic flooding, you can help as well. Here are the organizations providing urgent relief and essential services during what the National Weather Service has called an "unprecedented" natural disaster:

Airbnb

The company is allowing hosts to list homes in Austin, Dallas and San Antonio for free. Learn more here.

Airbnb has activated our host community to open their homes for $0 for those evacuating for Hurricane Harvey. https://t.co/bSXZPgh1HE — Airbnb Help (@AirbnbHelp) August 25, 2017

American Red Cross

The humanitarian organization is opening shelters, sending supplies and putting volunteers in place around Texas. You can donate money online or text "HARVEY" to 90999 to chip in $10. If you want to volunteer, read this.

Americares

The non-profit is accepting donations on its website.

Apple

The tech giant is making it easy for customers to donate to the American Red Cross directly through iTunes and the App Store.

Prayers for Texas and all those affected by #HurricaneHarvey. Join us in the relief effort by donating: https://t.co/QLBMFOjaDG — Tim Cook (@tim_cook) August 27, 2017

Austin Pets Alive!

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The organization says it has transported over 235 animals to its shelter since Saturday morning. How can you lend a hand? Make a donation, foster or adopt a pet, or volunteer. Find out more here.

Catholic Charities USA

Support our disaster relief efforts for #HurricaneHarvey & related floods. Text CCUSADISASTER to 71777 to donate. pic.twitter.com/mJFbsTC1BJ — CatholicCharitiesUSA (@CCharitiesUSA) August 26, 2017

Coastal Bend Disaster Recovery Group

Driscoll Children's Hospital

The hospital cares for kids in the Corpus Christi area. Learn about Driscoll's services here. You can make a donation here.

Feeding Texas

The state network of food banks is accepting donations.

Global Giving

The crowdfunding site is trying to reach a $2 million relief fund goal. You can contribute here.

Hurricane Harvey Relief Fund

Houston Mayor Sylvester Turner established the donation fund through the Greater Houston Community Foundation. Online donations are accepted here.

Salvation Army

We're on the frontlines of #HurricaneHarvey relief. Your support can help keep us there. Donate at 1-800-SAL-ARMY or https://t.co/YvaVQOscCd pic.twitter.com/CrLspBVMNc — Salvation Army EDS (@SalArmyEDS) August 27, 2017

Save the Children

The organization's emergency responders are on the ground and ready to help. You can donate to its relief fund here.

South Texas Blood & Tissue Center

Blood donors are urgently needed as the state deals with severe injuries and strained resources. The South Texas Blood and Tissue Center website appeared to be down Monday afternoon — but you can find a blood drive at this page.

Children walk near downed power lines and fallen trees left in the aftermath of Hurricane Harvey Saturday, Aug. 26, 2017, in Victoria, Texas. Charlie Riedel / AP

Southeast Texas Food Bank

The food bank, which is based in Beaumont, is accepting online donations here.

Southern Baptist Disaster Relief

The group has sent lots of supplies — rolled roofing, mold removal tools — and deployed volunteers. You can learn more and donate here.

The SPCA of Texas

The SPCA is asking for volunteers for helping with sheltering or transporting animals displaced because of the storm. Visit the Houston SPCA for more information or contribute a monetary donation here.

Texas Diaper Bank

The organization is sending out relief kits for babies, young kids, the elderly and disabled. You can donate here.