Berkeley Yacc (byacc) is a high-quality yacc variant. It is written to avoid dependencies upon a particular compiler. It was written around 1990 by Robert Corbett, who previously wrote Bison. This version has been modified to conform to ANSI C.
Berkeley Yacc, a parser generator(4)
Berkeley reimplementation of the Unix parser generator Yacc
Berkeley yacc, a LALR(1) parser generator
Best yacc variant available(2)
LALR(1) parser generator
The Berkeley Yacc general-purpose parser generator(2)
reimplementation of the Unix parser generator Yacc