10 Best Free and Open Source PHP Image Galleries | Design3edge: "Features
Automatically generated thumbnails and sized-down images
Upload via FTP or via the admin interface
Upload images, albums (folders) or even zip-archives
Comments on images and albums with powerful spam filters
AJAX-powered edit-while-you-browse
Video support for Flash Video (.flv), Quicktime (.mov) and 3GP (.3gp)
Password protection for gallery and albums
Watermarks for images"
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