Yepper, you heard (OK, read) that correctly: The Forgenator himself, Dr. Charles L. Forgy is, as of today, releasing the Rete-NT Algorithm as GNU source code to the world. It is totally free BUT you cannot make changes to the code and then try to keep your changes proprietary. (See the link to the licenses below.)
An article (soon to appear in the on-line version of InfoWorld per my over-worked and under-paid editor) should confirm that Dr. Charles L. Forgy, the original inventor of Rete (pronounced Ree'-tee in our industry regardless of how much Latin you had in high school or college) has released his invention into the wild. Not just the original Rete but Rete-NT, the latest and greatest! Yes, you read that right! Rete-NT is now available for download from PST on the GNU license. (Go to https://en.wikipedia.org/wiki/Comparison_of_free_and_open-source_software_licenses for a comparison of all of these license.)
This is basically a R(E)evolution in the BRMS / Rulebase World. Are you old enough to remember where you were when John Kennedy was assassinated in 1963? Or where you were when Neil Armstrong first walked on the moon in 1969? Or Gene Cernan last walked on the moon in December of 1972? (Most folk don’t remember Gene Cernan!) Actually, there are a few of us still around who remember the news that Pearl Harbor had just been bombed in 1941 or that we had dropped the first (and last) war-time atomic bomb in 1944.