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Qfsm is a graphical editor for finite state machines written in C++ using Qt the graphical Toolkit from Trolltech.

Finite state machines are a model to describe complex objects or systems in terms of the states they may be in. In practice they can used to design integrated circuits or to create regular expressions, scanners or other program code.

Current features of Qfsm are:

* Drawing, editing and printing of diagrams
* Binary, ASCII and "free text" condition codes
* Integrity check
* Interactive simulation
* HDL export in the file formats: AHDL, VHDL, Verilog HDL, KISS
* Creation of VHDL test code
* Diagram export in the formats: EPS, SVG, and PNG
* State table export in Latex, HTML and plain text format
* Ragel file export (used for C/C++, Java or Ruby code generation)
* Other export formats: SCXML, vvvv Automata code

Qfsm is being developed by Stefan Duffner and Rainer Strobel.