As St IGNUcious said, proprietary software is the sin. Using vi the penance.

In the name of all that is good and holy, do not go down that staircase

With projects like these, I’m always torn between thinking that it’s cool it’s possible, and horror that someone somewhere will try to use this in production code.

The only one I really remember is Trogdor, but in order to keep it in my heart, I am a proud owner of Trogdor!!: The Boardgame