Ask HN: What are some good examples of innovative software projects?

I'm looking to find out examples of the most innovative software projects.

I understand that in hardware there is a lot of innovation. But I'm trying to see what ideas exists in software world: can be a project, a language, a framework.

I'm looking to find things that brings a new perspective, a new concept, a new vision of the world, a new insight.

(Context: I will use these kind of examples in trying to inspire a generation of young software developers to generate ideas and implement them with resources they have available).