viperchill

ViperFeed adds a gorgeous footer to your RSS feed. This will be displayed for people who get your blog posts via email, or in an RSS reader like Google Reader and Bloglines. You can use this space for giveaways, encouraging comments, showing ads, or linking to other areas of your website.
<a href="http://www.viperchill.com/" rel="nofollow ugc">ViperChill</a>, a blog on Viral Marketing, is the creator of this plugin. If you want to take your blog to the next level, you should read this post on <a href="http://www.viperchill.com/wordpress-seo/" rel="nofollow ugc">WordPress SEO</a>.

ViperFeed

ViperFeed adds a gorgeous footer to your RSS feed. This will be displayed for people who get your blog posts via email, or in an RSS reader.

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.

ViperFeed vs Visual Footer Credit Remover