From Fedora Project Wiki
< Design
About GlitterGallery
GlitterGallery will be an amazing way to collaborate on design!
The goals are to allow designers to easily share their work, gather and parse feedback in a useful way, and version their work just as developers are able to.
GlitterGallery will be somewhat biased to support SVGs from Inkscape, and to work with the magicmockup rapid prototyping program. That doesn't mean it won't work with other filetypes, though!