The GNU Prolog native compiler
ECLiPSe Constraint Logic Programming System
Deductive Database with Datalog, SQL, RA, TRC, DRC
Java Internet Prolog (Moved to GitHub)
A cross platform audio inteface
Goal-directed answer-set programming
TuCSoN tuple-based coordination middleware
A 100% Java Warren Abstract Machine implementation.
(download) Linux Adequate"available approximately five days"