Microsoft PowerToys is a set of utilities for power users to tune and streamline their Windows 11 experience for greater productivity.
WingetUI is a GUI Store for the most common cli package managers, such as Winget and Scoop. It's developed by Martí Climent AKA martinet101.
Chris Titus Tech Windows Utility is the Ultimate Windows 10 & 11 script designed to be a swiss army knife of Windows tools to help setup and optimize machines. The Ultimate Windows Utility | Chris Titus Tech YouTube.
Chocolatey is a software management solution unlike anything else you've ever experienced on Windows. It focuses on simplicity, security, and infinite scalability. The GUI is perhaps the best way to start for beginners. It can be installed by using choco install chocolateygui after having installed choco as described here.
Scoop is an open source package manager for Windows 11. It gives Windows users an efficient way to download programs without having to visit each site manually, downloading the files, and running the installer.
Discover is an software center that let's you manage software from multiple sources, including your operating system's software repository, Flatpak repos, the Snap store, or even AppImages from store.kde.org. Also, Discover allows you to find, install, and manage add-ons for Plasma and all your favorite KDE apps.
KDE Plasma Discover App Store
Flathub is an app store and build service for hundreds of apps which can be easily installed on any Linux distribution. Browse the apps online, from your app center or the command line.
Flathub App Store
Note: Flathub app search will be integrated in Discover, if you want to limit the app search to Flathub you can mark Flatpak as default by clicking on the star.
Flatseal is a graphical utility to review and modify permissions from your Flatpak applications. Get it on Flathub store.