Automattic

INN Labs

This WordPress plugin gives site administrators a way to insert widgets such as ads, newsletter signups, or calls to action into posts at set intervals.
The plugin registers a configurable number of widget areas.
The plugin can programmatically insert these widget areas into posts when the page is rendered. This setting can be overridden on a per-post basis via a post meta box or a filter.
If the programmatic insertion doesn’t work for a particular post, users can choose to place specific widget areas at specific spots in the post using shortcodes or blocks.

Super Cool Ad Inserter Plugin

This plugin enables the insertion of widget areas in your post's content via programmatic insertion at display time, via a shortcode, or via bloc …

Scott DeLuzio

AMP-MODE

The In-Post Ads plugin allows you to save your most used ad codes, and insert them as a shortcode in your pages or posts.
You may already use a plugin to display your ads in a widgetized area of your page such as the left or right sidebars, or in the header or footer of your page. While this does get the ads on the page, your site visitors are not likely to click on them.
This plugin creates shortcodes, which you can use inside the body of any page or post to display an advertisement. This is where your reader’s eyes are looking anyway, and it will increase the odds that they will click on the ad.

In-Post Ads

A plugin to display ads inside your pages or posts.

Super Cool Ad Inserter Plugin vs In-Post Ads