MiniTool Power Data Recovery - MiniTool Power Data Recovery is a freemium data recovery tool that works quite well considering the basic version is the only free aspect of the app.
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.
Disk Drill by Cleverfiles - Recover any type of deleted files in Windows & Mac including Office documents, messages, and media files quickly and easily.
321Soft Data Recovery for Mac - The ultimate Mac Data Recovery software with RAID supported.
IObit Undelete - MacBooster 8, IObit official Mac app, helps you clean over 20 types of Mac junk files, easily free up Mac hard drive and make OS X run faster and secure your Mac OS X from Mac malware and Mac adware.
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.