I'm familiar with three, but they're new or sparsely populated (which may be what you're looking for).

LamerNews http://lamernews.com/ - Created by antirez to showcase a forum backed entirely by Redis.

Lobste.rs https://lobste.rs/ Created by jcs after he was hellbanned from HN

Monocle.io http://monocle.io Created by alex maccaw very recently.

I was reading about jcs. Interesting stuff, and he did a good job (especially with the color coded tags), and one of the better ones IMP

*IMO

Not mine:

http://drum.jupo.org/

blog post here:

http://blog.jupo.org/2013/04/30/building-social-apps-with-me...

There was one where it had no domain name, just an IP address, all the users were called operators and it had a light brown background.

Can't remember the IP though.

(Not having a domain name to stop certain demographics of people from visiting is a stroke of genius IMO.)

http://telesc.pe - Built in Meteor JS by Sacha Greif & Tom Coleman

I've seen that work before, something about it seems unfinished (not that I wouldn't run it), but HN has had time to mature and it's simplicity is what attracts me.

i'm still working on mine...

due to lack of knowledge or lack of time? What are you having trouble with the most?

It's one of a dozen-odd random projects i've got on the back burner because of school and having to make money, so time is an issue but i'm in no rush. Also though, since I'm doing it in Laravel 4, learning some of the framework's new features like the 'workbench' takes a bit of time.

I probably shouldn't have mentioned it but now i have this subtle prompt to get it done.