Check your other post and CNET's Storage Forum's Lost and Found top post for freebies I've used.
Read https://www.cnet.com/forums/discussions/lost-and-found-or-the-storage-forum-sticky-354911/
This external hard drive data recovery was listed by CNET as "free." Upon use of the program I soon found the use limited to only 100mb of data recovery and therefore not "free" per your definition. I unwisely purchased the full program, which did not work (froze for at least 12 hours each time). I emailed their customer service three times with no response. Finally, I emailed for a refund. Again no response.

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