Don't remember if I posted it here, but this tool could be useful in this industry especially. You know that Google ads snippet doesn't need any special ad manager at your site, because it automatically rotates ads and takes care of your visitors - their countries, system languages etc.
But in case if you want to show some independent sponsor's ads, such as affiliate program banners live cam chat boxes etc, you may want to have a simple and effective control over them.
You have to decide where, how and to whom these ads will be shown. You may want to have many ad companies, that rotate the ads, show them in some special positions of your site and every particular page (above content, below content, after some specified paragraph, heading, image etc).
You may also want to show some ads to visitors from one country and other ads to visitors from another place. You may want to show your ads according to the system language, used at the visitor's device.
You may want to show some ads on desktops, others on mobile devices etc. You may also want to show some ads for specific WordPress categories, tags or keywords in those pages and articles.
You may want to insert the ads as HTML blocks, as JavaScript snippets or even display them by means of your dynamically executed PHP code.
Want to the ads be inserted automatically? Shown as a widget? Or you want to insert them manually using WordPress shortcodes?
Everything that you can do with
WP Ad Inserter plugin. It's free and opensource.
I've checked those ad managers available in the WordPress.org repository and found them ugly and useless. None of them even supports GeoIP, so I decided to write my own.