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Grammatica is a C# and Java parser generator (compiler compiler). It improves upon simlar tools (like yacc and ANTLR) by creating well-commented and readable source code, by having automatic error recovery and detailed error messages, and by support for testing and debugging grammars without generating source code. Grammatica supports LL(k) grammars with an unlimited number of look-ahead tokens. It is fairly well tested, and has been self-hosting since version 0.1. The documentation contains a complete list of features, as well as a comparison to other parser generators.