No joke. http://www.guidewire.com/our_customers http://www.guidewire.com/our_customers lists some companies that are using the Guidewire insurance products in p

No joke. http://www.guidewire.com/our_customers http://www.guidewire.com/our_customers lists some companies that are using the Guidewire insurance products in production. These products are all built in a combination of Java and Gosu (or GScript, as it used to be called). [I don't work for Guidewire - I worked for an insurance company that evaluated several insurance claims packages, including Guidewire's.]