DiskWarrior - DiskWarrior, the world's most advanced and highest rated hard disk, hard drive, and disk repair and data recovery tool for macOS, OS X and Mac OS X.
DiskPatch - Did the entire hard disk go blank? Does Windows complain that the volume needs to be formatted?
321Soft Data Recovery for Mac - The ultimate Mac Data Recovery software with RAID supported.
Recuva - Accidentally deleted an important file? Lost files after a computer crash?
Data Rescue - When Apple's system recovery fails, recover any and all files with Data Rescue 3. This data rescue software will even work if your Mac's hard drive fails to mount.
Free Data Recovery Mate - Free File Data Recovery Software provides 4 recover modes