Tool for drawing automata and syntax trees [closed]

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I am searching for a free tool(s) to create visually appealing diagrams of finite automata and syntax trees.

Note: I really just want to draw diagrams. I do not have to create a model or do something fancy with it.

Thanks for your time.

EDIT:

I might add, that I am creating documentation in Latex and therefore I am also open to tex-based diagramming solutions.

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Does Graphviz meet your needs: creates diagrams from text example: http://www.graphviz.org/Gallery/directed/fsm.html