ACI Worldwide Inc

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S1Corporation, located in Atlanta, provides customer-interaction software solutions for financial and payments services. More than 4,000 customers in over 50 countries, including regional and national banks, community banks, credit unions, retailers, telephone companies and processors rely on its banking and payments software. Its ongoing research and development help to augment its range of products and services. S1's software products and services give retail banks, wholesale banks, and credit unions one source for software products that address all customer interfaces, including branches, call centers, Internet, voice and automatic teller machines, and point-of-sale channel needs. S1Corporation 's payments software, Postilion, is used by retailers, processors, telephone companies and financial institutions of all sizes.