BtYacc: BackTracking Yacc A modified version of yacc that supports automatic backtracking and semantic disambiguation to parse ambiguous grammars. It also has syntactic sugar for inherited attributes. http://www.siber.com/btyacc/

oolex (object-oriented lexer) Approaches lexical analysis by basing the scanner strictly on the object-oriented paradigm. It can be extended without access to the source code in that symbol recognizers can be derived by inheritance and an executing scanner can be reconfigured for different contexts. http://www.inf.uos.de/alumni/bernd/oolex/

GNU Bison A general-purpose parser generator that converts a grammar description for an LALR context-free grammar into a C program to parse that grammar. [Open source, GPL] http://www.gnu.org/software/bison/

Depot4 homepage A simple to use translator generator. http://www.math.tu-dresden.de/wir/depot4/

LLgen parser generator A tool for generating an efficient recursive descent parser from an ELL(1) grammar. The grammar may be ambiguous or more general than ELL(1): there are both static and dynamic facilities to resolve the ambiguities. http://www.cs.vu.nl/~ceriel/LLgen.html

The SYNTAX System A set of tools for the design and implementation of the front-end part of translators. The SYNTAX tools allow the generation of analyzers and the compilation of source texts with those analyzers. This has all the capabilities of lex and yacc plus some additional features including better error processing, i.e. an automatic (and tunable) error repair and recovery mechanism. http://www-rocq.inria.fr/oscar/www/syntax/syntax-eng.htm

ProGrammar object-oriented grammar definition language and integrated suite of visual tools that assist in building, testing and debugging parsers. http://www.programmar.com/main.shtml

Toy Parser Generator for Python 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 of everyday life. http://christophe.delord.free.fr/en/tpg/

Happy A parser generator for Haskell. http://haskell.cs.yale.edu/happy/

The LEMON Parser Generator Very simple LALR(1) open-source parser generator. Outputs C, claims to produce faster parsers than yacc/bison. http://www.hwaci.com/sw/lemon/

Turbo Pascal Lex/Yacc 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 language. The present version works with all recent flavours of Turbo/Borland Pascal, including Delphi and Free Pascal Compiler, a GPL'ed Turbo Pascal-compatible compiler which currently runs on DOS and Linux. http://www.musikwissenschaft.uni-mainz.de/~ag/tply/

A Compact Guide to Lex and Yacc Tutorial in Lex and Yacc, tools that simplify compiler construction. http://epaperpress.com/lexandyacc/index.html

iburg, A Tree Parser Generator Generates fast tree parsers for cost-augmented tree grammars. A variant of iburg is used in the code generators for lcc. http://www.cs.princeton.edu/software/iburg/

Yacc++(R) and the Language Objects Library Object-oriented rewrite of Lex and Yacc for C++, with automatic AST class generation, grammar inheritance, minimal state ELR(1) and technology. (Commercial package) http://world.std.com/~compres/

PCCTS Resources and The primary source of maintenance releases for the PCCTS compiler construction tool set. PCCTS is an LL(k) recursive descent parser generator with semantic predicates and backtracking. It was developed by T.J. Parr. http://www.polhode.com/pccts.html

CppCC (C++ Compiler Compiler) a scanner+LL(k = 1..Inf) parser generator for C++. Allows easy top-down description of grammars in an intuitive and extensible manner. Good generated code speed (as comared to GNU Flex/Bison). [Open source, GPL] http://cppcc.sourceforge.net/

BtYacc patches: BackTracking Yacc The version of BtYacc on siber.com suffers from a few minor, but annoying bugs. This is a page with patches. http://www.vendian.org/mncharity/dir3/btyacc/

The LEX & YACC Page All about Lex, Yacc, Flex, and Bison: Overview, Online Documentation, Papers, Tools, Pointers http://dinosaur.compilertools.net/

YooLex (Yet another Object-Oriented Lex) 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. http://yoolex.sourceforge.net/

Spirit C++ Parser Framework An object oriented recursive descent parser generator framework implemented using template meta-programming techniques. Expression templates allow to approximate the syntax of Extended Backus Normal Form (EBNF) completely in C++. http://spirit.sourceforge.net/