Hideki Tanaka

RSS Antennaは、他のWebサイトの更新情報をRSSから取得し更新日時の新しい順に一覧表示するプラグインです。 
プラグインを導入し、RSSを登録するだけで簡単にWordPressにアンテナページを構築できます。 
特徴
<ul>
<li>表示する記事を1件から30件まで設定できます。</li>
<li>記事の抜粋、画像のサムネイルを表示することができます。</li>
<li>広告記事を表示しない機能があります。</li>
</ul>
詳細な使用方法はこちらです: http://residentbird.main.jp/bizplugin/plugins/rss-antenna/

RSS Antenna

This plugin displays the RSS list from some sites on a page or a post or a widget.

Matthias Pfefferle

IndieWeb

joshfraz

This plugin is a simple way to let people know in real-time when your blog is updated. PubSubHubbub/WebSub is widely adopted and is used by Google Alerts and many other services. Subscription requests are relayed through hubs, which validate and verify the request. Hubs then distribute new and updated content to subscribers when it becomes available.
This plugin:
<ul>
<li>Sends realtime notifications when you update your blog</li>
<li>Supports multi-user installations (WordPress MU)</li>
<li>Supports multiple hubs</li>
<li>Supports all of the feed formats used by WordPress, not just ATOM and RSS2</li>
<li>Supports latest specs
<ul>
<li>PubSubHubbub <a href="https://pubsubhubbub.github.io/PubSubHubbub/pubsubhubbub-core-0.4.html" rel="nofollow ugc">Version 0.4</a></li>
<li>WebSub <a href="https://www.w3.org/TR/websub/" rel="nofollow ugc">W3C Version</a></li>
</ul>
</li>
<li>Announces which hubs you are using by adding <code><link rel="hub" ...></code> declarations to your template header and Atom feed</li>
</ul>
By default this plugin will ping the following hubs:
<ul>
<li><a href="https://pubsubhubbub.appspot.com" title="Demo hub on Google App Engine" rel="nofollow ugc">Demo hub on Google App Engine</a></li>
<li><a href="https://pubsubhubbub.superfeedr.com" title="SuperFeedr" rel="nofollow ugc">SuperFeedr</a></li>
<li><a href="https://websubhub.com" title="WebSubHub" rel="nofollow ugc">WebSubHub</a></li>
</ul>
Please contact me if you operate a hub that you would like to be included as a default option.

WebSub (FKA. PubSubHubbub)

Best Update Plugin

A better way to tell the world when your blog is updated.

RSS Antenna vs WebSub (FKA. PubSubHubbub)