TechTool Pro - Techtool Pro is a robust hardware diagnostic tool available for Macintosh.
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.
DriveDx - DriveDx is advanced drive health diagnostic and monitoring utility.
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.
321Soft Data Recovery for Mac - The ultimate Mac Data Recovery software with RAID supported.
Drive Genius - Drive Genius is a hard drive utility that speeds up, cleans up and optimizes your Mac.