ANTLR Formerly PCCTS, a language tool which provides a framework for constructing recognizers, compilers, and translators from grammatical descriptions containing C, C++, or Java actions. [Public Domain] http://www.antlr.org/

ParseView Visual Parser Debugger for ANTLR 2.x. [Public Domain] http://www.javadude.com/tools/parseview/

ANTLR Resources & Grammars Free grammars available for ANTLR, including Java 2 grammar and tree generator/parser, HTML grammar and IDL grammar. http://www.antlr.org/resources.html

Compiler Construction with ANTLR and Java The author discusses the experience of using ANTLR, with an introduction to the tool. (Gary L. Schaps / Dr. Dobb's Journal) http://www.ddj.com/documents/s=905/ddj9903h/9903h.htm

JACCIE Java-based Compiler-Compiler in an Interactive Environment. http://www2-data.informatik.unibw-muenchen.de/Research/Tools/JACCIE/