E-peen tiem

What's the best program you've ever made?
Both in terms of quality and complexity.
Personally, I've made a basic cli calculator with some trigonometric functions included.

>>7
I'm a computer wizard and I know how to incant the spells that conjure the spirits of my computer. I can make Hurd work for me and now, I'm working on improving it for the benefit of other Hurd users.