I manage quite a few websites for small businesses in my general area. Amongst other things, I help these businesses market themselves online. I was thinking of possibly creating an ad network to advertise these companies on each others website. Seeing as how they are all local companies I figure hat they can all benefit from cross marketing. My problem is I want to find an ad serving platform where I can create the ads for customers and randomly distribute them to the participating sites. Basically I want to be google adsense for my local customers. Does anyone know of any software that I can host myself, that can help serve up the ads. I searched around a lot and it seems most ad serving scripts are aimed at serving ads for only your own sites. I guess it is the same thing but I'm not sure. I found one open source script that seems like it would work (Oasis 2.3) but it was last updated in 2007 so I'm a little skeptical on how good their security is and stuff. Any help or suggestions will be greatly appreciated.