Currently I have one full time job and in my free time I am working on two StartUps. One of them is based in US and the second one is in Slovakia. Both are the same size (3 - 5 people), main project is a web application, but the approach is different.
It was a great idea to use git and create portal like GitHub and share source code among other developers. One of the benefits is, you do not need to reinvent the wheel and just use package you need. And because lot of users will add it to their projects, it gets well tested. But I can see there a big problem: maintenance.