John Hawkins

Ads For Old Posts inserts ads into posts older than a certain amount of days.
On the options page you’ll be able to set the location and design for your ad block. You can force ads to display at the start or end of a post, or you can now use the [afop] shortcode to manually insert the adblock in the middle of a page or post.
Note: In version 2.0 we rewrote how the data is stored in the database. If after you upgrade your ads aren’t showing, deactivate the plugin and reactivate it.

Ads For Old Posts

Ads For Old Posts inserts ads into posts older than a certain amount of days.

tljorgensen

Simple Post Inserter takes various inputs through the settings page and determines three things:
The content you wish to display in your posts, could be plain text, could be some HTML code. 
By default the admin of the site is responsible for any of the content submitted.
The location where the content should be displayed within the post.
Post restrictions. By default if no other setting but the content and location are declared, 
the plugin will insert the content in all of the posts available on the site. This may not be what you 
desire, but you can filter by post type, category, and ID.
Currently the only parameter for placement inside the posts is based off of total paragraphs in a post. 
This will likely change in a future update to something a little more sensible such as: lines of text or character counts.

Simple Post Inserter

Simple post inserter does what it sounds like. Insert some content into a post at your desired location.

Ads For Old Posts vs Simple Post Inserter