exploring xcode

6.26: proj.addn/dev.mac/find tutorial:
. organize downloads, find the tutorial that shows xcode .
review recent downloads .

proj.addn/dev.mac/access to projects with .xcodeproj file:
. I was surprised to see xcode understanding
what seemed to be a linux project;
. it had all the files being devoid of
type-specifying name ext's,
but it had a folder named xcode,
and inside was a .xcodeproj file;
then when I opened that, xcode was reading
all files in the surrounding project.folder .
. xcode is basically a gui for the
same gnu`dev.tools used by linux .]