An Enigma Simulator was created using an Arduino Uno and a touchscreen LCD. This device simulates an Enigma 1, Enigma M3 and M4 machines. Also home to PicoEnigma and MegaEnigma, two Universal Enigma Machine Simulators
The following article appeared in Hackaday. The premise is that development in Fritzing has stopped, the project appears to be dead. It is a shame, because in this cloud computing era, I like open source tools like Fritzing and Sketchup that can be installed and run forever in a standard Windows PC.
So far, the worst I have noticed is that a trace bend cannot have 4 traces branching out. Otherwise, I have not found other showstoppers with Fritzing. I do not use the autorouter for the latest boards.
The following posts show some of the good and bad of designing boards with Fritzing.