Used to peruse this every now and again, been a few years, https://builditwith.me

A hn user also launched http://www.weekendhacker.net which got a bit of traction at the time.

You have also reminded me of the Startup or Shutup thread someone started in 2012.

https://news.ycombinator.com/item?id=3394844

Some of the discussion is here...

https://groups.google.com/forum/m/#!forum/startup-or-shut-up

I recall the live document linked in the hn thread having activity at the time too but its not working anymore.