Timothy Wood

An addon to Gravity Forms to add an option to force your forms to be loaded SSL only. Fully supporting the latest version of Gravity Forms 1.9!
This plugin requires Gravity Forms 1.7+ and is tested through WordPress 4.1.
Thanks to the following users for making the plugin better! 
* @limecanvas
Additional Details:
<ul>
<li>This plugin is actively supported and we will do our best to help you.</li>
<li>This plugin has been tested on PHP 5.2.17, 5.3.14, 5.4.4 and WP 3.4, 4.0, and 4.1.</li>
<li>Background patterns used in the WordPress.org banner were created by http://subtlepatterns.com</li>
</ul>

Gravity Forms: Force SSL

An addon to Gravity Forms to add an option to force your forms to be loaded SSL only.

kevdog98

Verve SSL is a WordPress plugin that sets the WordPress login and Administration area to use HTTPS(SSL) and then after logging out of WordPress reverts back to HTTP automatically. This plugin also allows for HTTPS(SSL) while viewing your WordPress blog while logged in.
<h3>Features</h3>
<ul>
<li>Automatic SSL for WP-Login.php and Administration area </li>
<li>SSL security for entire logged in session – Even when browsing blog while logged in. </li>
<li>Automatically removes insecure content and updates it to secure while logged in. </li>
<li>PHP code only for better compatibility – No JavaScript code. </li>
<li>Easy installation – Just install the plugin on a site that has an SSL certificate and it works. </li>
<li>No changes to WP-Config.php required. </li>
<li>Compatible with WordPress 3.3.1 and higher, including 5.2.2</li>
<li>Reverts back to HTTP when logged off. </li>
<li>Converts URLs to lowercase for better SEO. 
None as of release 2.7</li>
</ul>

Verve SSL

Verve SSL is a WordPress plugin that sets the WordPress login and Administration area to use HTTPS(SSL).

Gravity Forms: Force SSL vs Verve SSL