show number of entries left

// http://www.gravityhelp.com/forums/topic/display-number-of-form-entries-left-per-form
// change 3 here to your form ID
add_filter('gform_pre_render_3', 'show_entries_left');
function show_entries_left($form) {
    // get the number of entries for this form
    $entry_count = RGFormsModel::get_lead_count($form['id'], "", null, null, null, null);

    // subtract the entry count from the limit to determine how many are left
    $left =  $form['limitEntriesCount'] - $entry_count;

    // append the number of entries left to the description displayed before the form
    $form['description'] .= "Hurry! Only <strong>$left</strong> more entries will be accepted.";

    // return the form
    return $form;
}