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Phraseanet is an Open Source Digital Asset Management (DAM) software. Web-based application intended for managing multimedia databases (photo management but also video, audio and PDF documents). Includes its own full-text / thesaurus search engine.
LinPHA is an easy to use, multilingual, flexible photo/image archive/album/gallery written in PHP. It uses a SQL database to store information about your pictures. It comes with a HTML based installer, so you don't need experience in setting up SQL