Didier Sampaolo

Every Snippet can have tags and a format (which are custom taxonomies) attached to it. On display, the plugin will search for snippets with the same tag and/or format, and display one of them acccordingly. If multiple snippets are available, one of them will be randomly choosed on every page refresh.
You can use this plugin for your ads, but also for any HTML/Javascript/CSS code you wish to display on multiple pages.

wp Pause Ads

This plugin allows you to create HTML/CSS/JS Code Snippets and to embed them anywhere in your posts, using a shortcode.

AdSpeed.com

AdSpeed.com is a hosted ad server and ad manager. You enter your ads and targeting criteria into AdSpeed. We serve ads, track and report real-time statistics about ad impressions, clicks, revenue, and conversions. You manage your ad inventory through our online user-friendly interface.
Requirements
To use this plugin, you need an active account with AdSpeed Ad Server. To sign up for an ad management account, please visit this page: 
<a href="https://www.adspeed.com/Publishers/register.html" rel="nofollow ugc">https://www.adspeed.com/Publishers/register.html</a>
Ads on the Sidebar
Navigate to “Appearance > Widgets”. Click on a specific Widget Area you would like to edit. Select the + prompt to add a block. Search for “AdSpeed Ad Server”. For each block (ad placement), you need to specify a zone identification number. This zone ID must exist within your AdSpeed account and do NOT enter the zone name. You can find the zone ID under the first column of the zone list in your AdSpeed account.
Ads in a Blog Entry
To use it in a post, write this macro “{AdSpeed:Zone:1234}” to display an ad from zone #1234. In this example, “1234” is a zone identification number in your AdSpeed account. Do NOT enter the zone name. This macro will be replaced with the actual ad tag for the zone in your post. You can find the zone ID under the first column of the zone list in your AdSpeed account.
Styling Ad Block
Each ad placement is enclosed within a DIV container with CSS class “AdSpeedWP” so you can change/customize ad styles like color, border, spacing, margin, alignment, etc.

AdSpeed Ad Server

This plugin displays ads from your AdSpeed account on the sidebar or within a post. Ads are served, managed and tracked for impressions and clicks by  …

wp Pause Ads vs AdSpeed Ad Server