Monetra is a scalable payment processing engine for Linux, Unix, and Windows. It is designed to handle credit, debit, gift, EBT, and check authorizations and is certified to support major clearing house protocols. Features include support for multiple modems, multiple merchant accounts, and multiple processors, all simultaneously -- as well as IP and SSL connectivity along side SQL database support. Designed in C, conforming to POSIX standards, and utilizing light weight processes (threads), this product is able to handle a large number of transactions with high speed and minimal CPU usage.
The stunnel program is designed to work as an SSL encryption wrapper between remote client and local (inetd-startable) or remote server. It can be used to add SSL functionality to commonly used inetd daemons like POP2, POP3, and IMAP servers without any changes in the programs' code. It will negotiate an SSL connection using the OpenSSL or SSLeay libraries. It calls the underlying crypto libraries, so stunnel supports whatever cryptographic algorithms you compiled into your crypto package.