Be it a historical project, a brilliantly built npm package, an application, etc. What has struck you as an incredible feat of software development?
It doesn't have to be massive in scope, it could just be one awesomely thought out class, but if you've ever been incredibly impressed, let's hear about it.
One of the most consolidated misconceptions about programming, since the early days, is the idea that such activity is purely technical, completely exact in nature, like Math and Physics. Computation is exact, but programming is not.