WebSight Designs

This plugin allows you to set up a custom login page, including your logo. It also allows you to set a custom footer by adding in your own text or HTML.
<ul>
<li>Allows you to specify a URL to an image you’d like to use as your WordPress Admin login page’s logo.</li>
<li>Allows you to specify your own text and/or HTML to replace the footer of the WordPress Admin with.</li>
<li>Sets the URL of your blog as the URL visited when a user clicks the logo on the WordPress Admin login page.</li>
<li>Sets the title (seen when you hover your mouse over the logo) of the logo’s link to be your blog’s name.</li>
<li>Allows you to specify the background color and the text/links color of the WordPress Admin login page.</li>
</ul>
Please take a moment and rate this plugin at: 
https://wordpress.org/support/plugin/wp-customize/reviews/

WP Customize

This plugin allows you to set up a custom login page, and set a custom footer message in the WordPress Admin.

Riyaz

Using this plugin user can customize admin footer. User can remove wordpress version and modify copyright text in admin footer.

WP Customize vs Admin Customization