dFactory

<a href="http://www.dfactory.co/products/download-attachments/" rel="nofollow ugc">Download Attachments</a> is a new approach to managing downloads in WordPress. Instead of bloated interface it enables simple, drag & drop and AJAX driven metabox where you can insert and manage your Media Library files and automatically or manually display them after, before or inside posts content.
For more information, check out plugin page at <a href="http://www.dfactory.co/" rel="nofollow ugc">dFactory</a> site.
<h4>Features include:</h4>
<ul>
<li>Automatic or manual download links display</li>
<li>Select post types where Download Attachments should be used</li>
<li>Select list, table or sortable, dynamic table display style</li>
<li>Downloads count</li>
<li>Advanced attachments sorting</li>
<li>Most Downloaded Attachments widget</li>
<li>Drag & drop files ordering</li>
<li>Based on Media Library attachments</li>
<li>Easy customisation of Frontend & Backend display</li>
<li>Pretty URLs for download links</li>
<li>Encrypt URLs by default</li>
<li>Customizable tamplates engine</li>
<li>Custom download slug</li>
<li>Custom permission for metabox display</li>
<li>Option to exclude selected attachments from display</li>
<li>Option to select from all Media Library files or only those attached to a post</li>
<li>2 shortcodes</li>
<li>5 functions and multiple filter hooks for developers</li>
<li>Option to use attachment caption and/or description for download links description</li>
<li>Compatible with WPML & Polylang</li>
<li>.pot file for translations included</li>
</ul>
<h4>Get involved</h4>
Feel free to contribute to the source code on the <a href="https://github.com/dfactoryplugins" rel="nofollow ugc">dFactory GitHub Repository</a>.

Download Attachments

Download Attachments is a new approach to managing downloads in WordPress. It allows you to easily add and display download links in any post or page.

eugenealegiojo

The plugin that will let admin user to add download links to any posts/pages in simplest way and hassle free. 
Allows all your site visitors to download any files from your website without any user restriction.
<h4>Features</h4>
<ul>
<li>Downloader button is available in your admin content editor for post, page or post type. Shortcode will be generated automatically.</li>
<li>Insert download links manually via shortcode [media-downloader] to any posts, pages or custom post types. Check for more parameters below (Embedding).</li>
<li>Allow users to directly download in all file formats for free.</li>
<li>No file size limit for downloads. 
For more information please check the <a href="http://phplugins.softanalyzer.com/simple-file-downloader/" rel="nofollow ugc">Simple File Downloader</a> documentation page</li>
</ul>
<h4>Embedding / generated Shortcodes</h4>
Create a new post/page and click the ‘Add Download’ button from the content editor, then generate the shortcode below:
<pre><code>[media-downloader media_id="9" texts="Download Now!"]
</code></pre>
Media id is automatically added from your media library.
Here are the all the available parameters when generating shortcode for file download:
texts
If you choose to leave the texts parameter empty, then it be defaulted to ‘Download File’.
image_url
You can also use image/button as your download link. If you supplied this parameter, then texts parameter will be replaced by this image.
<pre><code>[media-downloader media_id="9" image_url="http://domain.com/wp-content/themes/images/button.png"]
</code></pre>
class
You can add class to your download link either a texts or image button. This is useful if you want to apply your own style.
<pre><code>[media-downloader media_id="9" texts="Download PDF" class="download-pdf"]
</code></pre>
display_filesize
You also have an option to display the size of the file. Just set it to ‘yes’
<pre><code>[media-downloader media_id="9" texts="Download PDF" display_filesize="yes"]
</code></pre>

Simple File Downloader

Simplest way to add download links into your posts/pages.

Download Attachments vs Simple File Downloader