There are several free and open source data recovery software options available. Some popular ones include:
(1) TestDisk:
TestDisk is a free and open source data recovery software that is available for Windows, Mac, and Linux. It is designed to recover lost partitions and make non-booting disks bootable again.
(2) PhotoRec:
PhotoRec is a free and open source data recovery software that is available for Windows, Mac, and Linux. It is designed to recover lost files, including photos, videos, and documents, from a variety of storage devices.
(3) DMDE:
DMDE is a free and open source data recovery software that is available for Windows. It is designed to recover lost files from a variety of storage devices, including hard drives, SSDs, and USB drives.
(4) Recuva:
Recuva is a free and open source data recovery software that is available for Windows. It is designed to recover lost files from a variety of storage devices, including hard drives, SSDs, and USB drives.
(5) MiniTool Partition Wizard:
MiniTool Partition Wizard is a free and open source data recovery software that is available for Windows. It is designed to recover lost partitions and recover lost data from a variety of storage devices.