Lychee by Electerious - Lychee is an open-source, free software program for self-hosted photo management. It can be installed on the user's own server or website. The software permits the uploading and management of photos and also makes sharing photos very easy.
Piwigo.org - Manage your photo collection with Piwigo. Piwigo is open source photo gallery software for the web. Designed for organisations, teams and individuals.
Chevereto - Chevereto is a powerful and fast image hosting script that allows you to create your very own full featured image hosting website in just minutes.
novaGallery.org - Beautiful php image gallery - easy to use, with modern responsive design, private mode, themes, languages
MediaGoblin - MediaGoblin is a free software media publishing platform that anyone can run.
PhotoStructure - PhotoStructure is a complete photo and video management application designed for the whole family.