On which Script this community/ forum is built

I am inspired by the way this community/ forum functions. that is why i want to know on which script this forum is built and if it is not a custom script from where i can download this.



Regards

I am inspired by the way this community/ forum functions. that is why i want to know on which script this forum is built and if it is not a custom script from where i can download this.

Regards