Jabawack

Simple Custom Posts per Page (SCPP) allows to configure the number of posts displayed for every custom post registered in WordPress.
See <a href="https://wordpress.org/extend/plugins/simple-custom-posts-per-page/screenshots/" rel="ugc">Screenshots</a> to known why it is called “Simple”.
In your Readme page in Setting tab of WordPress, it adds an option for every post type.
Disable Plugin in Template: 
You can disable plugin filters in your template whenever you want. Maybe you need a query with a different number of custom posts per page for a specific post type. 
Using this code before your query, the filter plugin will be disabled for a specific post type:
<pre><code><?php $GLOBALS['ado_cspp_disable']="YOUR_TYPE"; ?>
</code></pre>
With this code, you can use your personalized query for your loop.
More: 
You can find more informations in the official <a href="http://www.adostudio.it/blog/simple-custom-posts-per-page-397/" rel="nofollow ugc">Post</a> on my Blog.

Simple Custom Posts per Page

This plugin allows to configure the number of posts displayed for every custom post registered.

WPZOOM

Pavel Ciorici

Custom Posts Per Page Reloaded allows you to specify how many posts are displayed per page depending on your current view. Once settings are changed, the Blog pages show at most setting in the Reading menu will be ignored.
Settings are available for:
<ul>
<li>Home (Index) Page
<ul>
<li>As long as view is set to blog posts, not static page.</li>
</ul>
</li>
<li>Category Pages</li>
<li>Tag Pages</li>
<li>Author Pages</li>
<li>Archive Pages</li>
<li>Search Pages</li>
<li>Default Page (Any page not covered above.)</li>
<li>Custom Post Type archive pages
<ul>
<li>All Custom Post Types are detected automatically.</li>
</ul>
</li>
</ul>
Each of the above settings can have a different value for the first page displayed and subsequent paged views.
Custom Posts Per Page makes it easy to manage exactly how your content is displayed to your readers, especially when different views have different layouts, rather than relying on the single setting in the Reading menu or having to hard code options in your custom theme.
This is a fork (an updated clone) of <a href="https://wordpress.org/plugins/custom-posts-per-page/" rel="ugc">Custom Posts Per Page</a> by <a href="https://jeremyfelt.com/" rel="nofollow ugc">Jeremy Felt</a>.

Custom Posts Per Page Reloaded

Custom Posts Per Page Reloaded provides a settings page in your WordPress admin that allows you to specify how many posts are displayed for different  …

Simple Custom Posts per Page vs Custom Posts Per Page Reloaded