Winaero Tweaker
Winaero Tweaker lets you adjust settings that Microsoft does not provide from the user interface. In addition, it allows you to add extra value to existing Windows apps and tools with advanced context menus, options, and handy commands.
This utility supports Windows 7, Windows 8, Windows 8.1, Windows 10, and Windows 11 and includes hundreds of settings.
Excellent free alternative to Windows, also very suitable as modern operating system on older PCs (DVD iso).
Ultimate Boot CD 5.3.9 assembles over 100 PC hardware diagnosis tools into one bootable CD to analyze and repair hard drives and to fix boot problems (CD iso).
Provides ongoing improvements to the Windows Operating System (OS), includes previous updates delivered over Windows Update as well as continuing incremental updates to the Windows 7 platform (DVD iso)
Windows 11 UX Pack transforms your Windows system 10 into Windows 11 with themes, wallpapers, and sound effects.
WinRAR is a powerful archive manager that is compatible with many compression formats. It is commercial software, but you can use it for free.
Windows Repair is a tool designed help fix a large majority of known Windows problems including registry errors, file permissions, issues with Internet Explorer, Windows Updates, Windows Firewall and more.
macOS Transformation Pack greatly resembles real macOS from Windows side.