Simsttab (which stands for "Simplistic School Time-Tabler") is a timetabling engine that can generate timetables satisfying requirements typical for secondary schools in Austria ("Gymnasium"-type), Germany, and maybe other European countries. It supports coupling of lessons and rudimentary room reservation.
Ciao is a complete Prolog system subsuming ISO-Prolog with a novel modular design which allows both restricting and extending the language. Ciao extensions currently include feature terms (records), higher-order, functions, constraints, objects, persistent predicates, a good base for distributed execution (agents), and concurrency. Libraries also support WWW programming, sockets, and external interfaces (C, Java, TCL/Tk, relational databases, etc.). An Emacs-based environment, a stand-alone compiler, and a toplevel shell are also provided.