Prasanna SP

Just like the normal WordPress site feed, wordpress categories and tags also has feeds. The category feed is located at <code>site.url/category/categoryname/feed</code>. This plugin automatically adds the RSS feed link to the current post categories after the post content. By default the plugin shows category feed link on single posts. You can change it’s settings to show it on other pages, such as archives as well. You can change it’s title in WP-Admin –> Settings –> Follow Category Feeds.
Visit <a href="http://www.prasannasp.net/wordpress-plugins/" rel="nofollow ugc">this page</a> for more WordPress Plugins from the developer.
Visit <a href="http://www.prasannasp.net/" rel="nofollow ugc">developer’s blog</a> for more information on WordPress and plugins.

Follow WordPress Category Feeds

This plugin adds link for the category feeds after post content.

Matthias Pfefferle

julien51

This widget adds a <a href="http://www.subtome.com/" rel="nofollow ugc">SubToMe</a> button to your WordPress blog. This button allows your readers to follow your blog using their favorite applications.
If the user clicks the button, then, it will load an external iframe with JavaScript. The iframe will show the user the list of their favorite subscription tools. Once they pick one, they’re redirect to it with your blog information.
The user information is stored in the browser, but is only accessible on the domain <code>subtome.com</code>, which is why we have to load the iframe.
No data is ever “leaked”. The whole <a href="https://github.com/superfeedr/subtome" rel="nofollow ugc">SubToMe code</a> is open source. Feel free to check it out by yourself.
<h3>Credits</h3>
<a href="https://github.com/tommcfarlin/WordPress-Widget-Boilerplate" rel="nofollow ugc">WordPress Widget Boilerplate</a>, <a href="http://notizblog.org/" rel="nofollow ugc">Matthias Pfefferle</a> for his precious help, mostly with version 1.3!

SubToMe

This widget adds a SubToMe button to your blog and allows people to subscribe to your content in one click.

Follow WordPress Category Feeds vs SubToMe