epipe-com

This plugin adds a favicon link to the document head section.
There are no options. The link is always added when the plugin is enabled.
The <code>favicon.ico</code> file needs to be uploaded to the site’s root 
directory. If you do not know how to do this, you should have a look at 
one of the other favicon plugins.

The Simplest Favicon

Adds a favicon link to the document head section.

Chip Bennett

As of WordPress 4.3, this Plugin is no longer needed. The next update will integrate the Plugin into the core site icon feature, to allow for graceful 
retirement of the Plugin.
Add a Favicon to your site. No bells or whistles; simply upload a (ICO, PNG, or GIF) file.
Note: Plugin settings can be configured via Dashboard -> Settings -> Favicon.

cbnet Favicon

Add a Favicon to your site. No bells or whistles; simply upload a (ICO, PNG, or GIF) file.

The Simplest Favicon vs cbnet Favicon