The BUGS project has evolved through four main versions: ClassicBUGS,[3]WinBUGS,[4]OpenBUGS[1] and MultiBUGS.[5] MultiBUGS is built on the existing algorithms and tools in OpenBUGS and WinBUGS, which are no longer developed, and implements parallelization to speed up computation. Several R packages are available, R2MultiBUGS acts as an interface to MultiBUGS, while Nimble is an extension of the BUGS language.
Alternative implementations of the BUGS language include JAGS and Stan.
^ McGrayne, Sharon Bertsch (2012). The Theory That Would Not Die: How Bayes' Rule Cracked the Enigma Code, Hunted Down Russian Submarines, and Emerged Triumphant from Two Centuries. Yale University Press. p. 226. ISBN9780300188226.