Emil

Lazy Webhook Relay for WPForms quietly sends every WPForms submission from your WordPress site to a remote endpoint of your choice. It doesn’t interrupt WPForms.
It retries failures, signs requests with an HMAC hash, and logs its activities in <code>/uploads/lazy-webhook-relay-for-wpforms.log</code>.
Features: 
* Works with any WPForms form (no setup per form) 
* Async background sending (non-blocking) 
* Choose GET or POST 
* Retries with exponential backoff 
* Optional shared secret for HMAC signing 
* Lightweight logger 
* Simple settings screen
<h3>License</h3>
This plugin is licensed under the GPLv2 or later.

Lazy Webhook Relay for WPForms

Are you a lazy developer? This plugin sends every WPForms submission to an endpoint in the background. Make that data someone else's problem!

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.

Lazy Webhook Relay for WPForms vs WebSub (FKA. PubSubHubbub)