Adserver

Does anyone know of any good adserver software that is either low priced or free. I found this one and it’s been go but I’m finding problems with it now.

www.adpeeps.com

and I also know of phpmynews or something like that and it was extremely complicated. anyone have a better solution? i basically need something that rotates ads and keeps track of the hits. In fact if you think you could program something better let me know.

thanks
joel kendall