PicLJooS is a CGI/perl image gallery that is easy to setup and fun to use. A distinguishing feature is its JavaScript folder tree for easy navigation. It also allows viewing of images scaled to sizes you choose. Uses ImageMagick.
High speed, low bandwidth, fully customizable image gallery based on smart templates. Class switching to utilize imagemagick if available, or GD if not. Allows wiki style dynamic page management and some simple ajax interface admin tools.