twapaw

Opes WP Ads Manager is a simple plugin that allows you to show advertisements as a widget on the website
 Just works! 
Major features in Opes WP Ads Manager include:
<ul>
<li>Since version 1.2.0 only one widget can be add and only two ads can be shown</li>
<li>An ad as a custom post type</li>
<li>An every ad can link to specific web page</li>
<li>A widget generator</li>
<li>A custom post featured image used as an ad</li>
<li>Ad sizes management (use Regenerate Thumbnails plugin to extend management of the sizes image files)</li>
</ul>
PRO Version (available soon) features:
<ul>
<li>Stats</li>
<li>Not limited widgets and ads can be add</li>
<li>Management of order of ads in a widget</li>
</ul>

Opes WP Ads Manager

Opes WP Ads Manager allows you to show advertisements on the website

goodloop

Good-Loop makes it easier to earn money from your site while also supporting charities that you care about. Set-up is easy: simply place the widget on your page.
More information is available at https://www.good-loop.com/how-it-works.

Good-Loop ad widget

A more ethical approach to advertising: 50% of ad revenue is donated to charity, and users are in control. Engaged users means more revenue for you.

Opes WP Ads Manager vs Good-Loop ad widget