New! The first public alpha of Jess 8.0 is now available to licensed users on the Downloads page. Jess 8.0 includes support for the Android platform. Jess is a rule engine and scripting environment written entirely in Oracle's® Java™ language by Ernest Friedman-Hill at Sandia National Laboratories in Livermore, CA. Using Jess, you can build Java software that has the capacity to "reason" using kno