Janis Elsts

Normally when you login to your blog WordPress will create a session cookie that is used to authenticate you. If someone was to steal the cookie they would be able to use it to get full access to your blog without having to know your password. This plugin prevents that from happening – it makes the cookie specific to your IP address, so it won’t be usable from a different computer.
Use this plugin if you have a static IP. If you have a dynamic IP address and it changes often you will get logged out frequently.
A bit more info can be obtained from the <a href="http://w-shadow.com/blog/2008/07/12/safer-cookies-plugin-for-wordpress/" title="Safer Cookies homepage" rel="nofollow ugc">Safer Cookies homepage</a>

Safer Cookies

Ties the WP session cookie to your IP address so that it can't be used to get access to you blog from another computer.

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'.

Safer Cookies vs Gravity Forms Dynamic Fields