Istream is a suite of integrated products and services that bundles services required for various aspects of insurance processing, including product development, State filing and regulatory compliance, Sales and application support, Document assembly and delivery, Document storage and retrieval and Customer communication. The suite's four modules, ProductFlow, SalesFlow, ContentFlow, and ServiceFlow, integrate the functionality of formerly discrete software applications that were sold under the brand names Calligo Enterprise, Calligo Doc Services, Correspondence, Tracker, Fastforms, and Writer.