Question

It is possible to use the Mage_Catalog_Model_Resource_Eav_Mysql4_Setup out of Magento?

require_once "app/Mage.php";
Mage::app();

//Use the setup model

I want to use the attribute functionality (addAttribute(), etc).

Answer 1

Yes, just like you would do so in Magento:

require_once 'app/Mage.php';
Mage::init();

$setup = Mage::getResourceModel('catalog/setup', 'core_setup');
$setup->addAttribute(...);