DPC Latency Checker (DPC) is a valuable tool that helps identify and diagnose issues related to Deferred Procedure Call (DPC) latency on Windows systems.
WSCC - Windows System Control Center is a freeware app that will install, update, execute and organize utilities from suites such as Microsoft Sysinternals and NirLauncher.
BurnInTest Windows is a software tool that allows all the major sub-systems of a computer to be simultaneously tested for reliability and stability. Also available for Linux.
Windows Repair Toolbox includes most third-party applications and utilities you might need to repair any Windows problems in one small application. Video tutorial available.
Sergei Strelec's WinPE 64-Bit for Windows 10/11 creates a bootable DVD or thumb drive for PC maintenance, including partitioning, backup and restoring, diagnostics, data recovery, and more. There are 32 and 64-bit and a smaller update available.
BIOS Beep Codes Viewer helps diagnose computer issues by interpreting BIOS beep codes during system checks and start-up. Portable version is also available.
SARDU multiboot creator builds a multiboot USB stick (or other removable) for PC and Mac with Utilities, Antivirus, Windows PE, and more in a few minutes without making partitions and without any knowledge of Multiboot systems.