Gregg

This plugin allows you to change the footer text on the bottom left of the admin page.
Once activated, navigate to the Settings -> nuAdmin Footer and change the Footer text/HTML. You can use html to link to your website, your help desk, your email or anything you would like. If you find the plugin to be useful and would like to donate, you can do so in the Settings.
Here’s a link to <a href="http://www.tripleginteractive.com/blog/wordpress/custom-admin-footer/" title="free wordpress plugin: custom admin footer" rel="nofollow ugc">the blog post on this topic</a> for more information. Future version’s will have much more capabilities.

nuAdmin Footer

This plugin allows you to change the footer text on the bottom left of the admin page.

Glamdea

Remove the footer of your theme and hide all credits links. Just install and activate the plugin and you’re done. No complicated settings or extra steps to do. 
Note: Once you activate the plugin, you might need to clear your cache in order to see the results, if you dont have a cache plugin you can always download one. 
Please have a look on the following websites to see an example on how your footer might look like after using our plugin: 
<a href="https://glamdea.com/" rel="nofollow ugc">Glamdea</a> 
<a href="https://dubaislawyers.com/" rel="nofollow ugc">Dubai’s lawyers</a> 
<a href="https://eventmanagement.cateringindubai.com/" rel="nofollow ugc">Event Management Dubai</a>

Remove Footer Credits & Powered By

In just one click hide all credits links in your footer. Just install and activate the plugin and that's it.

nuAdmin Footer vs Remove Footer Credits & Powered By