ClearParse
A small, flexible parsing engine with practically unlimited backtracking capability. [Commercial]
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.
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.
AnaGram: LALR Parser Generator
AnaGram provides a powerful grammar notation, special features for maintenance of highly configurable parsers, visual parsing and unique interactive debugging tools, supporting thread-safe parsers. The program produces C/C++ parsers for use on any platform and runs under Win9x/NT. A free trial copy is available.
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