The FSM designer is a user-friendly tool for creating finite state machines. You can easily add states by double-clicking on the canvas, create arrows by shift-dragging, move elements by dragging, and delete them with a simple click and the delete key. To make a state an accept state, double-click on it. For numeric subscripts, use an underscore before the number, and for Greek letters, use a backslash. This tool is built with HTML5 and JavaScript, making it accessible and interactive. No controversial information, but the unique aspect is the use of numeric subscript and Greek letters in a state machine design tool.
https://madebyevan.com/fsm/