TCLink is a client for running credit card or ACH (electronic check) transactions over TCP/IP, via the TrustCommerce gateway. It features a simple, cross-platform protocol, fail-over server support, and encrypts communications using the OpenSSL library. It includes a test merchant account, so that you can run demo transactions out of the box. PHP, Python, Perl, Ruby, and C language implementations are available as seperate archives from the project homepage.
