Free diagram software for mac

ANTLRWorks 1.3b brings users a novel grammar development environment for ANTLR v3 grammars, which combines an excellent grammar-aware editor with an interpreter for rapid prototyping and a language-agnostic debugger for isolating grammar errors. ANTLRWorks allows users to edit, visualize, interpret and debug any ANTLR 3 grammar through an easy-to-use graphical user interface.

ANTLRWorks helps eliminate grammar nondeterminisms, one of the most difficult problems for beginners and experts alike, by highlighting nondeterministic paths in the syntax diagram associated with a grammar. ANTLRWorks' goal is to make grammars more accessible to the average programmer, improve maintainability and readability of grammars by providing excellent grammar navigation and refactoring tools, and address the most common questions and problems encountered by grammar developers

Major Features:

1. Editor
   • Single window editing
   • Syntax highlighting
   • Rule navigation tree
   • Jump to rule or token definition
   • Go To Rule
   • Find usages of tokens or rules
   • Find and Replace using regular expression
   • Sensitive keyword, rule, and token auto-completion
   • Rules and actions folding
   • Tips and ideas
   • Auto-indentation
   • Refactoring - remove left recursion, extract or inline rule, etc.
   • Show generated lexer or parser code using syntax coloring
   • Syntax diagram display for lexer and parser rule
   • Show unreachable alternative(s) in syntax diagram
   • Display nondeterminism warning as ambiguous paths through the syntax diagram
   • Highlight decision DFA
   • Rule dependency graph
   • Export syntax diagram, NFA and parse tree to bitmap image or EPS file
   • Perforce integration
   • emacs key bindings (Mac OS X only)
   • Contextual menus
   • Print
2. Grammar interpreter
   • Dynamically interpreter any input text
   • Display parse trees as list or graph
3. Grammar debugger
   • Local or remote debugger
   • Language agnostic
   • Dynamic parse tree
   • Dynamic AST
   • Tree grammar debugging
   • Lookahead highlighting
   • Breakpoint in grammar
   • Breakpoint in input text!
   • Breakpoint on any events - LT, consume token, exception, etc.
   • Step over rule
   • Show corresponding grammar location and parse tree node for each input token
   • Detachable panels
4. Code generation:
   
   • ANTLRWorks supports code generation in any language that ANTLR knows how to generate via the output=language option.
   • For Java, however, ANTLRWorks knows how to build a test harness, compile everything, launch the parser, and connect to it--a great rapid prototyping feature when you can't use the interpreter because actions and/or semantic predicates must execute.

Enhancements:

• New Grammar Wizard
• StringTemplate Editor
• Custom test rig
• Run an input directly on the grammar

Reverse Snowflake Joins is a free and open source tool that parses SQL Select statements and generates a diagram. The diagram will show parts of the underlying SQL directly in the diagram.
For example x=30 , GROUP BY (year), HAVING MIN(age) > 18. It is easy to see cartesian joins and/or loops.

System requirements:
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Enhancements
- If possible, aliases are displayed inside the tables they belong (previously they were displayed each in its own frame).
- Some progress with subselects, to be finalized later.