Thomas M

WPAds is a free plugin for showing and managing ads on your WordPress site. It works very similarly to other ad servers, but because of its limited functionality, it is much easier to use.
<blockquote>
Please read before updating
This is a fixed version of WPAds which was not hosted on wordpress.org before. 
 I updated this plugin to work for existing users with a newer version of WordPress, but would suggest new users to use <a href="https://wordpress.org/plugins/advanced-ads/" rel="ugc">a better ad management plugin</a>. 
 Please, don’t update if you don’t use at least WordPress 4.7.
</blockquote>
The main concepts of WPAds are zones and banners. After creating zones you can insert these ad positions in your template or in your posts, e.g. as positions for ads in header, sidebar or content. Than create some banners, paste the ad code you want to display and assign them to your ad zones. WPAds will serve your ads randomly to those positions. The rotation is based on a variable weight of your ads.
WPAds can show different ad formats (HTML, JS; PHP, Image ads) and support ad networks like Google AdSense, Yahoo Publishers Network, Amazon or Chikita.
Features:
<ul>
<li>shortcodes for injection into posts and templates</li>
<li>unlimited ads</li>
<li>unlimited zones</li>
<li>ad rotation</li>
<li>ad weight</li>
<li>impression counter</li>
<li>max. views per banner</li>
</ul>

WPAds

WPAds is a simple and light weight ad manager for WordPress.

andreyberestov

Berestov Element Scheduler replaces the inner HTML of selected frontend elements by schedule.
It can match a parent element by class or ID and replace everything inside that parent with the value you define.
Supported schedule groups:
<ul>
<li>Weekdays</li>
<li>Odd and even month days</li>
<li>Odd and even ISO weeks</li>
<li>Persistent replacement</li>
</ul>
Features:
<ul>
<li>Unlimited rules</li>
<li>Search by class or ID</li>
<li>Class mode works across all matched elements</li>
<li>Multiple different rules per schedule slot</li>
<li>Duplicate prevention inside the same slot</li>
<li>Server-side, JavaScript, or Auto replacement mode</li>
<li>UTC offset based switching</li>
<li>Drag and drop schedule UI</li>
<li>Translation-ready admin UI</li>
</ul>
Use cases:
<ul>
<li>Rotate phone numbers</li>
<li>Schedule banners</li>
<li>Switch promo blocks</li>
<li>Replace HTML snippets by schedule</li>
</ul>
Days without a rule stay unchanged.
Security
<ul>
<li>Capability checks and nonce validation for all administrative actions.</li>
<li>Strict sanitization and option whitelisting for all saved settings.</li>
<li>Only explicitly allowed configuration fields are accepted.</li>
<li>HTML output follows WordPress capability rules (unfiltered_html).</li>
<li>No external requests or file operations performed by the plugin.</li>
</ul>

Berestov Element Scheduler

Schedule frontend element replacements by day, parity, or persistent rules.

WPAds vs Berestov Element Scheduler