The Vtiger CRM project provides a complex solution for integrating your Drupal website with Vtiger CRM 6.x. It consists of three separate modules that contain different bunches of functionality. The modules work as a one-side synchronization (Drupal to Vtiger), however developers can do anything they want with getter methods of the Vtiger API.
MoneyScripts is a discontinued product by Leighton Whiting. We, a group of customers, have decided to take development, maintenance and support on our own due to Leighton's fail to accomplish his compromise.