ericjuden

This plugin allows you to use $_COOKIE, $_SERVER, $_SESSION, $_GET, $_POST and $_REQUEST data in a Gravity Form through the merge tags of a field. I’ve only really tested this using a hidden field.

Gravity Forms Extended Merge Tags

It's amazing how few people seem to know about this plugin. Incredibly simple, but also really helpful when using $_SESSION variables to track website visitors.
I use it to get referring website data, so I can easily store it in a $__SESSION variable. Then when the visitor fills out a Gravity Form, I can pass along the stored vars.
I crafted a Lead Source Tracking for Salesforce script that uses this plugin to pass along the details to Salesforce when a form is submitted.



Brilliantly simple

This plugin allows you to use $_COOKIE, $_SERVER, $_SESSION, $_GET, $_POST and $_REQUEST data in a Gravity Form through the merge tags of a field.

zaus

Insert cookie, session, page, or other kinds of values dynamically into Gravity Forms fields.
Similar to how <a href="https://wordpress.org/plugins/forms-3rdparty-dynamic-fields/" rel="ugc">Forms: 3rdparty Dynamic Fields</a> can insert dynamic values into the 3rdparty submission.

Gravity Forms Dynamic Fields

Dynamically fill fields with session, cookie, or other values, based on 'Forms: 3rdparty Dynamic Fields'.

Gravity Forms Extended Merge Tags vs Gravity Forms Dynamic Fields