PEPsy - Prolog extended with parallel modules within which explicit OR-
parallelism can be used. "PEPsy: A Prolog for Parallel Processing", M.
Ratcliffe et al, ECRC TR CA-17, 1986.
PEPsy Programming Language
http://www.programming-languages.co.uk/pepsy.html
Large list of computer programming languages arranged alphabetically, with explanations.