for a gravity form with the ID of 1, adds a URL to feedwordpress assuming the fields are in the order presented

fwp-gf-url-adder.php

add_action( 'gform_after_submission_1', 'fwp_gf_url_adder', 10, 2 );


function fwp_gf_url_adder($entry, $form){
    $url = rgar( $entry, '1' );
    $name = rgar( $entry, '2');
    $cat = rgar($entry, '3');
    $linkdata = array("link_url" => $url,
                    

                  // varchar, the URL the link points to
                  "link_name" => $name,
                    
                  // varchar, a URL of an associated RSS feed
                  "link_rss" => $url,
                   
                  // int, the term ID of the link category. if empty, uses default link category
                  //remember these cat ids are for the link categories NOT post cats, set the id as a value in gf
                  "link_category" => (int)$cat 

                    );
     
     if (!function_exists('wp_insert_link')) {
         include_once (ABSPATH . '/wp-admin/includes/bookmark.php');
     }
     
     wp_insert_link($linkdata, true);
}