1)   Olvio.Ecommerce for Authorize.Net 1.0
Olvio.Ecommerce is a payment processing class library for the Authorize.Net gateway. It includes all the latest features, SIM and AIM integration methods, CC and ECHECK processing, hash validation, response stream reader and more.

 2)   kCharge 2.0
kCharge is a powerful Windows application that provides a fast, safe, and secure way to process incoming credit card payments on your PC. kCharge works with your existing credit card merchant account and all of the major Internet gateways.