The most current version of PHP eXhibition is exhibition_rev212, and is being hosted at SourceForge where you can view the Subversion files.

PHPeXhibition is an open source PHP/MySQL visual art publishing system, for use by artists, art dealers, art galleries or just about anyone who wants to display visual art online. PHPeXhibition is under active development, and is looking for both developers and testers.

Home page: phpexhibition.org