Data input: Generate C# output (look to developer console for errors):

Export as: PNG

The big white box above is the FSM designer.  Here's how to use it:

• Add a state: double-click on the canvas
• Add an arrow: shift-drag on the canvas
• Move something: drag it around
• Delete something: click it and press the delete key (not the backspace key)
• Select some nodes: click on empty space and select, click ctrl to select disjoint areas
• Move and zoom: use wheel and wheel mouse click to move and zoom view

• Make accept state: double-click on an existing state
• Type numeric subscript: put an underscore before the number (like "S_0")
• Type greek letter: put a backslash before it (like "\beta")

This was made in HTML5 and JavaScript using the canvas element.