Try Shimmie2. It works like the danbooru or ouroboros style imageboards. Requires LAMP stack and php-gd, and ffmpeg if you want video thumbnails. - Stores fi

Try Shimmie2. It works like the danbooru or ouroboros style imageboards. Requires LAMP stack and php-gd, and ffmpeg if you want video thumbnails. - Stores files by md5 hash and doesn't allow duplicates. - Database is used to store tags and support searching and is not very large. - Can tag pictures and search by tag. - Is fast. Can handle large number of images and large number of search results. - Can enable pools feature and arrange pictures in a pool. - Can enable wiki feature, which while primitive, is nice for adding notes. - Is multiuser.