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.
321Soft Data Recovery for Mac - The ultimate Mac Data Recovery software with RAID supported.
Disk Drill by Cleverfiles - Recover any type of deleted files in Windows & Mac including Office documents, messages, and media files quickly and easily.
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.
DriveDx - DriveDx is advanced drive health diagnostic and monitoring utility.