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Really Simple Ad Injection plugin will help you automatically inject any kind of ad code inside your post content.

Really Simple Ad Injection

Really Simple Ad Injection plugin will help you automatically inject any kind of ad code inside your post content.

Vladimir

This is an Ads management WordPress plugin. It offers unlimited count of code blocks, which can be easily customized and placed wherever you want.
Main features: 
1. Unlimited ads/widgets creation 
2. A lot of default places for blocks (Top/Middle/Bottom/After some tags/After Post) 
3. Simple native interface 
4. Support any Ads code (HTML/JS) 
5. Deffered js ads initialization in footer 
6. Include/Exclude ID policy 
7. Group ads for faster management 
8. Import from other ads management plugins

RedPic ADS Manager Lite

Легкий и простой плагин, раньше пользовался Quick Adsense. Этот проще и удобнее. 

Лучше чем Quick Adsense

JS/HTML ads block manager. Allows you to create and insert blocks of code anywhere on the blog.

Really Simple Ad Injection vs RedPic ADS Manager Lite