No commentary, just the facts. I used the MSIX_Commander on my own Windows 11 desktop to look at all of the AppX/MSIX software that is on the system right now. While I have added a small number of third-party apps, nearly all of this is from Microsoft as part of the OS. It took two screenshots.

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PsfTooling is the free tool to work in conjunction with the Microsoft MSIX Packaging Tool. 
The Package Support Framework (PSF) was originally an open-source project to help Win32/DotNet applications run when inside an MSIX Container. TMurgent has taken up the support for the PSF in our own fork 