Vertical Computer Systems, Inc. (VCSY) is a provider of Internet core technologies, administrative software, and derivative software application products through its distribution network.

VCSY's primary Internet core technologies include SiteFlash™, ResponseFlash™, and the Emily XML Scripting Language, which can be used to build web services.

VCSY's main administrative software product is emPath®, which is designed to handle the most complex Payroll and Human Resources challenges.