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.

There is a portal for connecting startup CoFounders. http://www.cofounderslab.com While this portals connects anyone with inclination towards startup, you might also find enthusiast developers for your side project.(which can later turn into a startup if you are interested)

Yes, I would be interested.

It could be a nice idea to let users add topics they are interested in building something for. Then, when someone else have the same interests, send out an email.

For example. I am working on an iOS application about the Thai language. And it would be awesome to find someone else interested in it. But it feels strange to ask about either one in forums related to either one.

This idea sounds like it would devolve into an advertising board of weekend projects really fast. Which might not be that bad.

There's https://www.indiehackers.com, which is pretty popular. They have a relatively active forum (even though it could use some work as a lot of good discussions can go unnoticed), plus founder interviews and a good podcast.

Yeah, would be interesting if you could somehow make it easy to figure out who would make a good fit.

I would

I would