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I'm looking for the program that JSON, SQLite and other projects are using to create the diagrams used for their language syntax, if there is a particular program. All of the diagrams have a similar style, with partially curved connections or arrows indicating flow.

There are some differences, making me wonder if it's a single program or just generic graphing tools used for a particular style.

JSON Digit SQLite Select Statement

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The top one is from json.org and was drawn by Douglas Crockford using Visio. See stackoverflow.com/q/796824/477035 as in Chris W. Rea's answer. –  RedGrittyBrick Dec 27 '11 at 22:25
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up vote 3 down vote accepted

As you can see by my edits to your question, the kind of syntax diagram you're referring to is also known as a railroad diagram. Wikipedia mentions a few tools under the "External Links" section, including:

See also these related Stack Exchange questions:

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