A Microsoft open-source framework for building native device applications spanning mobile, tablet, and desktop.
if you click browse code, it will take you to the github site, you just clone:
git clone <url from code picker on site>
for the maui samples it:
git clone https://github.com/dotnet/maui-samples.git
the shell is in the 7.0/Fundamentals/Shell/ folder
note: the repo has all the sample. you can get github tool that allow extraction of just a folder.