Nice wysywyg security tool that will teach people concepts behind the interface. In my day we'd just use perl or python, but this opens up the field to beginners.
It took me a few years in my career to realize the interface usability is more important than the cleanliness of the code. As an engineer I loved my code and treated the interface like a second class citizen. After a bit of experience I realized the interface is what the user judges your code by. First impressions matter and the UI is your code's first impression.