WordPress Form Plugins: Get list of all available forms

contact-form-7.php

<?php
$forms = get_posts(['post_type' => 'wpcf7_contact_form', 'posts_per_page' => -1]);

if (empty($forms)) {
    return [];
}

return array_combine(wp_list_pluck($forms, 'ID'), wp_list_pluck($forms, 'post_title'));

gravity-forms.php

<?php
if (!class_exists('GFAPI')) {
    return [];
}

$forms = GFAPI::get_forms();

if (empty($forms)) {
    return [];
}

return array_combine(wp_list_pluck($forms, 'id'), wp_list_pluck($forms, 'title'));