ChainBuilder ESB is a new Java Business Integration (JBI) compliant open source Enterprise Service Bus. ChainBuilder ESB allows IT developers with Service Oriented Architecture (SOA) infrastructures to create standards-based ESB components through Eclipse-based graphical user interfaces. Most organizations SOAs need to include strategic backend systems that operate with non-XML data formats and non-HTTP communication protocols. Bostech focus on usability ensured the initial offering of ChainBuilder ESB had industry standard editors to manage EDI X12, fixed and variable formats and communication components for ftp and file protocols - the formats and protocols that organizations with legacy applications absolutely require. ChainBuilder ESB also has uncommon high-end open source features, like an AJAX-based Console web interface for monitoring and controlling the production environment, usually found only with expensive proprietary systems. Bostech Corporation is deploying a dual-license distribution model for ChainBuilder ESB. Developers can download the open source software under the common GPL license at http://www.chainforge.net. A commercial license is also available for use where GPL is not available and for partners who do not release source code for their applications.