Can be found at: Gallery Main Website
Gallery is an integrated web photo album that is based on PHP, newer versions (2, 2.0.1) also use MySQL for a backend. This software makes it easy for normal Windows users to upload their digital photos to the internet for friends and family to see and enjoy. Chris uses the Gallery software on the Tips From the Top Floor website. Gallery is fully customizable and integrateable into any software/CMS application. It is highly recomended for any photography buff.
For an example of a Gallery installation see: Zack's Picture Gallery
Included in Photoshop
In the automate menu, these galleries give you a choice of styles, and Photoshop will re-size, watermark and produce galleries ready for inclusion with your web site.
Example galleries at http://www.phooto.co.uk
Part of iLife on Mac OS X, easy to use and uploads pictures from iPhoto to your .Mac web space, this is probably the easiest way around to create a gallery on the web. You don’t need to know anything about web servers, html, re-sizing at all.
Example iWeb galleries at http://web.mac.com/phooto