Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
TechTool Pro - Techtool Pro is a robust hardware diagnostic tool available for Macintosh.
Guru3D - Guru of 3D: PC Hardware Reviews and tests
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.
Geforce Experience - GeForce Experience is a new application from NVIDIA that optimizes your PC in two key ways.
Disk Drill by Cleverfiles - Recover any type of deleted files in Windows & Mac including Office documents, messages, and media files quickly and easily.