About this forum

Sorry for making my first topic about a thing not closely related to PKP, but rather about this forum itself.
Where else would I post my question then?
I have been searching the web for an ‘open source’ platform specially created to manage a forum. I found some with many features, but in my opinion, this forum is far better than all of them.
How can I get the software that runs this forum? or I can’t?

This forum runs on Discourse – it is free, open source software.