Shea Bunge

This plugin changes the default ‘Thank you for creating with WordPress’ in your footer area to a more personal ‘Thank you for visiting My Site’ on all admin pages except the Network Admin. There is no configuration; simply install and activate.
Visit the <a href="https://sheabunge.com/plugins/personal-admin-footer/" rel="nofollow ugc">plugin homepage</a>, or contribute to its development at <a href="https://github.com/sheabunge/personal-admin-footer/" rel="nofollow ugc">GitHub</a>.
Spanish translation provided by Andrew Kurtis from <a href="http://www.webhostinghub.com/" rel="nofollow ugc">WebHostingHub</a>. 
Serbian translation provided by <a href="http://firstsiteguide.com" rel="nofollow ugc">Ogi Djuraskovic from FirstSiteGuide.com</a>.

Personal Admin Footer

Welcome users to your dashboard with a personal 'Thank you for visiting My Site' in the footer

upwerd

Remove or replace the footer credit of any WordPress theme with the click of a mouse.

Visual Footer Credit Remover

Remove or replace footer credit of any WordPress theme with the click of a mouse.

Personal Admin Footer vs Visual Footer Credit Remover