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)   NELiX TransaX FleXport 4.1
NELiX TransaX FleXport contains dox and examples for integrating credit card and ACH acceptance within any application! Examples in Access, ASP, .NET, FileMaker, 4D, PHP, ColdFusion, iMIS, Ruby, QuickBooks, Flash/Flex, FoxPro, VB6, and OS Commerce.