http://www.puransoftware.com/File-Recovery-Download.html
quite nondescript but there's a portable there with a RAW disk recovery mode which came to my dire rescue today.
Interface simple and straightforward.
Succeeded where these didn't:
Recuva - rcvPortable (file recovery utility)
https://portableapps.com/apps/utilities/rcvportable
Wise Data Recovery Portable (data and file recovery)
https://portableapps.com/apps/utilities/wise-data-recovery-portable
FreeUndelete
https://www.majorgeeks.com/files/details/freeundelete.html
Free File Recovery
https://www.majorgeeks.com/files/details/free_file_recovery.html
ddrescue (Linux)
An excellent set of PC data recovery software. To that list I can also add the Partition Recovery. This program has shown excellent results.