JavaCC - The Java Compiler Compiler is a parser generator originally by Sun Microsystems. [Freeware]
JELLRAP - The Java Enhanced LL LR Animated Parser is a graphical tool to parse strings using a variety of algorithms; LLParse and LRParse combined into a single tool that will run on multiple platforms. [Open Source]
JFlex - Lexical analyzer generator (also known as scanner generator) for Java, written in Java. A rewrite of JLex with more features. [Open Source, GPL]
MixedCC - Mixed Compiler Compiler - Parser generator capable of parsing and handling inner layer stacks of multi-layer templates. Open source in Java. Parsing mechanism works as Detachable-Layer Stack Machine. SPIndent is implementation of MixedCC for JSP/PHP/ASP.
Modern Compiler Implementation in Java - JLex and CUP, Andrew Appel's Lex and YACC equivalents. LALR parser generators. The tools are free, the book their use is described in can be ordered here. [Freeware]
SableCC - Object-oriented framework, written in Java, that generates compilers (and source-interpreters) for Java. [Open Source, LGPL]
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