Some of its unique features:
- Flux Debugger - Allows integrated debugging of ANTLR grammars along with java code. You can even see parse trees/ASTs being formed and input text being parsed along the way.
- Syntax Diagrams - Diagrams are formed in real time as you type your rules.
- Lexer Wizard - Allows generation of complex lexers within minutes.
A single user license is available for 49$. A fully functional 11 day evaluation license is available as well.