[krapp]

Data is stored in flat text files containing Arc Lisp tables, or in RAM. There is no 'database' per se, unless they've added one and not mentioned it.

You can get the software and language HN is based on here: http://arclanguage.org

[niclo]

I think the link is broken, it's not HTTPS

[krapp]

Force of habit, I fixed it.

[russelg]

I love the design similarity to HN.

[CobaltFire]

That’s because HN is just about the only thing written in Arc, and everything else you see is a fork of an earlier version of HN.