bozdoz

<a href="https://wordpress.org/plugins/jetpack/" rel="ugc">Jetpack</a> makes it easy to add contact forms to your WordPress site, but you may want a simple way to add a <a href="https://www.google.com/recaptcha/" rel="nofollow ugc">Google reCAPTCHA</a> to prevent spam. This plugin will manipulate the Jetpack <code>[contact-form]</code> shortcode to prepend the Google script, add a button, and parse the response.
This plugin allows both reCAPTCHA v2 and invisible reCAPTCHA (see screenshots and choose whatever works for you!).
Shoot me a question about it on Twitter: <a href="https://www.twitter.com/bozdoz/" rel="nofollow ugc">@bozdoz</a>.
This plugin is open source on <a href="https://github.com/bozdoz/wp-plugin-recaptcha-jetpack" rel="nofollow ugc">GitHub</a>!

reCAPTCHA Jetpack

A simple plugin that adds a Google reCAPTCHA to the Jetpack contact form. Requires the Jetpack plugin.

Jeremy Herve

Extends the Jetpack plugin and allows you to add sharing buttons anywhere inside your posts thanks to the [jpshare] shortcode
Important: for this plugin to work, you must activate <a href="https://wordpress.org/extend/plugins/jetpack/" rel="ugc">Jetpack</a> first, and activate the sharing module.
This plugin is a work in progress. You can report issues <a href="https://wordpress.org/support/plugin/jetpack-sharing-butttons-shortcode" rel="ugc">here</a>, or submit a pull request <a href="https://github.com/jeherve/jp-sd-shortcode" rel="nofollow ugc">on GitHub</a>.

Sharing buttons shortcode for Jetpack

Extends the Jetpack plugin and allows you to add sharing buttons anywhere inside your posts thanks to the [jpshare] shortcode

reCAPTCHA Jetpack vs Sharing buttons shortcode for Jetpack