The following programs are provided free of charge, but there is a price to pay for getting something free. Don't expect any updates or support, if you get into trouble. Free software is usually under constant development, so don't expect them to be 100% bug free, either. These programs are really only recommended, if you have some programming skills or knowledge of setting up and debugging CGI scripts.

BannerFusion
Can be used to serve banners on up to and beyond 1,000 sites, with up to 100 banners per site. Can also be used as a banner exchange or pay-per-click network. Seems to offer many other features.

BannerMatic
Has all the usual features, but don't expect updates, as the last release was July 8, 1998.

DAD
DAD is an advanced website ad management system that has been used to serve millions of impressions a month in a site. DAD has advanced targeting capabilities and can target ads by many factors, including remaining impressions, browser, domain name, number of times a user has seen an ad, virtualhost-specific environment variables, and other ads on a given page.

These advanced targeted options are not usually available on banner serving software costing several hundred Dollars, let alone in a free program.

Random Image Displayer
A very simple banner serving program.

I would recommend that you use a banner serving software package to serve and track your banners. You would need to know how to install CGI scripts on your server, although some companies offer to install them for you, for a small fee.

CentralAd Pro: $595
I use an older version (Pro 3.0J - approx $160.00) of Central Ad's banner rotation program to manage my advertiser's banners in this site.

WebAdverts: $50
WebAdverts can be used to rotate banner ads on your site or for setting up a "banner exchange" between your site and others.

If you don't have access to a CGI server, or don't want the hassle of setting up a banner serving program, try one of these companies. They will serve your banners in your site, either for a fee or percentage of your banner impressions.