I am only 90% sure, but these look like purely
gDesklets-powered
desktops. They have a wide variety of displays available
(including calendars), so I won't enumerate here what was
used in these screenshots: go on their site and pick what you
like! ;-) Yours,
________________
Sylvain
P.-S. Usually, screenshots on lynucs.org come with some
description, and the a few ways to get in touch with the
submitter: most likely, submitters will be happy to give you
the fine details.