Is there any platform where we can find developer/designer or where designer and developers collaborate and contribute. There are lot of website where this things happens but they are much like a bulletin board, what I am looking for is a platform which can ease in discovering developers designers who are willing to collaborate. I don't want to find a cofounder, or a lead, I just want to collect bunch of people and start working on the idea just like you do in a hackathon.
Drupal, .NET, Ruby - all kinds of hangouts for different groups of people making cool things everyday.
Check collaborators on successful github.com projects. There are lots of linkedin.com groups too