Build Your Own Flickr with Piwigo

Piwigo, formerly called PhpWebGallery, is a Web-based program designed to upload, organize and archive photos. It supports tagging, categories, thumbnails and pretty much every other on-line sorting tool you can imagine. Piwigo has been around long enough that there even are third-party applications that support it out of the box. Want mobile support? The Web site has a mobile theme built in. Want a native app for your phone? iOS and Android apps are available