Good point. Their main website does not use HTTPS but they do have some screenshots of demo sites. [1] It appears anyone can submit their gallery site, so browse with care.
[1] - http://galleryproject.org/gallery/g3demosites/index.html
[1] - http://galleryproject.org/gallery/g3demosites/index.html
All of this gives me phpnuke vibes. Would not recommend.