Not many people know it exists, but there is PHP-GTK. Being the nature of PHP its not really the best for using as a main windows or linux based server program, but still quite possible. I toyed around with making an Ultima Online emulator with server admin tools built right into the server. Ran decently, but no longer have the files. Just tossing it out there since few know it though. Suggest getting gnope GUI Development with PHP-GTK2 - User Interfaces to go along with it. If any interest arises out of this I'll start posting some tutorials to get people started with it.