Someone mentioned TwoStopBits[1] in a comment[2] today, and I know there's the original Arc Language forum [3]. I remember seeing one other heavily modified one with a cool dark colourscheme, but I don't remember which.

1. https://twostopbits.com

2. https://news.ycombinator.com/item?id=42358749

3. http://arclanguage.org/forum

Here the source: https://github.com/arclanguage/anarki

Huh. I had no idea the design wasn't original. Thanks for posting this unintentional TIL!

It's pretty much original. Paul Graham made the Arc programming language, and the forum software / Hacker News on top of that.

Is the source code available for free use or is it a paid software offering?

Hacker News itself is closed source, but the old `news.arc` code is available under the Artistic License 2.0.

https://news.ycombinator.com/item?id=5006037

https://www.perlfoundation.org/artistic-license-20.html