A Flex like scanner code generator, but it generates C++ scanner classes that are re-entrant and compatible with the newer standard of C++/STL. Multiple scanner classes and instances can co-exist in a program without tweaking of macros.

Closed-source, but free LALR(2) parser generator, accepts yacc input with some extensions.

Object-oriented rewrite of Lex and Yacc for C++, with automatic AST class generation, grammar inheritance, minimal state ELR(1) and technology. (Commercial package)

An LR(1) parser by Intralogic for Backus-Naur form and generating parse tables DLL's in .NET assembly.

a compiler generator for Turbo Pascal and compatibles. The package contains two programs, TP Lex and Yacc, which are approximately compatible with the UNIX utilities Lex and Yacc, but are written in and produce code for the Turbo Pascal programming la...

TPG is a parser generator for Python. Given a simple attributed grammar, TPG produces a Python Recursive Descent Parser. It is simple and useful for small parsers for everyday use.

Produces compact and efficient table-driven LL(k) parsers in C, C++, C#, and Java. Features include automated grammar transformations, clean EBNF syntax, backtracking, new LL(k) algorithms, and an uncomplicated API.

A parser generator which compiles attributed LL(1) grammars decorated with C semantic actions into recursive descent compilers.

All about Lex, Yacc, Flex, and Bison: Overview, Online Documentation, Papers, Tools, Pointers

Very simple LALR(1) open-source parser generator. Outputs C, claims to produce faster parsers than yacc/bison.