This is my own implementation of "neat-python" in Java. I couldn't find any implementation, that is usable for everything, just implementations which can only be used in specific games etc. I really worked hard on it so please take it as it is. I am also not done with it but that will come!
I hope it is useful to you!
(For the pictures of the functions, I used the source code of neat-python where is already a program to create the images of functions!