Surbma

CherryPick Studios

With Offline Mode, features that do not require a connection to WordPress.com servers can be activated.
This plugin is using the jetpack_offline_mode filter to enable the Offline Mode. If you are familiar with ftp and file edit, you can also add the <code>define( 'JETPACK_DEV_DEBUG', true);</code> to the wp-config.php file. Make sure you add it before the <code>/* That's all, stop editing! Happy blogging. */</code> line.
This plugin also checks if the Jetpack plugin is already activated, so it is safe to use this plugin.

Surbma | Jetpack Offline Mode

Enables Jetpack's Offline Mode, to use some modules without having a WordPress.com account.

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.

Surbma | Jetpack Offline Mode vs reCAPTCHA Jetpack