DiskPatch - Did the entire hard disk go blank? Does Windows complain that the volume needs to be formatted?
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.
Recuva - Accidentally deleted an important file? Lost files after a computer crash?
321Soft Data Recovery for Mac - The ultimate Mac Data Recovery software with RAID supported.
Free Data Recovery Mate - Free File Data Recovery Software provides 4 recover modes
DriveDx - DriveDx is advanced drive health diagnostic and monitoring utility.