CellarWebAds - advertising display system
This is a free/open-source solution for easily displaying advertising on a web site. Written with PHP/MySQL, it is a simple solution, requiring only two lines of code in a web page to display advertising graphics.
An administrative interface allows access to the MySQL tables used in the display of the advertising. Reporting and billing is included as part of the package, and there are some easy customization features available. Full documentation and screen shots are included on the web site.