denishua

AideRSS is a service that helps you to prioritize news feeds based on the amount of social activity around them. Using an algorithm called PostRank, which tracks the number of comments, Digg votes, del.icio.us bookmarks and more, it will process any feed you enter and spit out feeds of All Posts, Good Posts, Great Posts, Best Posts and the Top 20.
AideRSS have released API and PHP Class. Base on the PHP Class, I create a simple WordPress plugin which can display the top posts for the specified time period.

AideRSS WordPress Plugin

Show the top posts for your WordPress blog base on AideRSS

GNPublisher

GN Publisher makes RSS feeds that comply with the <a href="https://support.google.com/news/publisher-center/answer/9545420" rel="nofollow ugc">Google News RSS Feed Technical Requirements</a> for including your site in the <a href="https://publishercenter.google.com/" rel="nofollow ugc">Google News Publisher Center</a>.
The plugin addresses common RSS compatiblity issues publishers experience when using the Google News Publisher Center, including:
<ul>
<li>Incomplete articles</li>
<li>Duplicate images</li>
<li>Missing images or media</li>
<li>Missing content (usually social media/Instagram embeds)</li>
<li>Title errors (missing or repeated titles)</li>
<li>Cached RSS feeds causing slow updating</li>
<li>Delayed crawling by Google</li>
</ul>
After installing, click on the ‘Dashboard’ under GN Publisher on your plugins page for additional information about applying and troubleshooting issues related to the Google News Publisher Center.
New in 1.5.24 
Compatibility with Apple news publish
New in 1.5.11 
Google Reader Revenue Manager support.Reader Revenue Manager provides publisher solutions to deepen audience engagement and convert subscribers or contributors.
New in 1.0.9
GN Publisher now displays the time of the most recent ping and feed fetch from Google. This helps when troubleshooting the dreaded ’empty sections’ issue in the Google News Publisher Center.
New in 1.0.6
GN Publisher now pings Google when feeds are updated. This can help with faster updates in your Google News Publication.
<h3>Support</h3>
We try our best to provide support on <a href="https://wordpress.org/support/plugin/gn-publisher/" rel="ugc">WordPress GN Publisher plugin support forum</a> forums. However, We have a special <a href="https://gnpublisher.com/contact-us/" rel="nofollow ugc">team support</a> where you can ask us questions and get help. Delivering a good user experience means a lot to us and so we try our best to reply each and every question that gets asked.
<h3>Bug Reports</h3>
Bug reports for GN Publisher: Google News Compatible RSS Feeds are <a href="https://github.com/ahmedkaludi/gn-publisher/issues/" rel="nofollow ugc">welcomed on GitHub</a>. Please note GitHub is not a support forum, and issues that aren’t properly qualified as bugs will be closed.
<h3>PRO Version</h3>
Take you Google News Feed experience to next level by using our <a href="https://gnpublisher.com/pricing/#pricing" rel="nofollow ugc">GN Publisher PRO</a> plugin which contains the following features.
<ul>
<li>Content Scraping Protection </li>
<li>Exclude Categories From Main Feed </li>
<li>Google News Sitemap </li>
<li>Compatibility with Flipboard.com</li>
<li>Compatibility with PublishPress Authors</li>
<li>Compatibility with Translate Press</li>
</ul>

GN Publisher: Google News Compatible RSS Feeds

GN Publisher makes RSS feeds that comply with the Google News RSS Feed Technical Requirements for including your site in the Google News.

AideRSS WordPress Plugin vs GN Publisher: Google News Compatible RSS Feeds