ANTLRWorks 1.0b11 - A Graphical Dev. Environment for developing ANTLR grammers. (Free): "
ANTLRWorks 1.0b11
ANTLR, ANother Tool for Language Recognition, (formerly PCCTS) is a language tool that provides a framework for constructing recognizers, compilers, and translators from grammatical descriptions containing Java, C#, Python, or C++ actions. ANTLR is popular because it is easy to understand, powerful, flexible, generates human-readable output, and comes with complete source. ANTLR provides excellent support for tree construction, tree walking, and translation. There are currently over 5000 ANTLR source downloads a month."