Institute for Practical Computer Science (System Software Group).

Coco/R combines the functionality of the well-known UNIX tools lex and yacc, to form an extremely easy to use compiler generator that generates recursive descent parsers, their associated scanners, and (in some versions) a driver program, from attribu...

Takes as input a compiler description in the form of an LL(1) attributed grammar and generates a scanner and parser. [Freeware]

This group at the university of Linz offers lots of public domain packages for the Oberon System V4, as well as they continue to maintain this Oberon System variant.