What forum software does DLang Forum run on?

[Tim]

Hi,
I'm a tourist passing by. I stumbled across this forum via a 
hacker news thread complaining about Discourse forum UX. The OG 
post favored paginated, hierarchical  forums.

In any case, someone linked to this forum, as a pleasant example 
of how forums can be done well. I love the UI and the UX, so I 
had to sign up to ask what forum software it is running on?


Thanks!
Tim.