I haven't studied the stories of those companies that closely, but to be successful, you have to use the resources you have wisely. One of those resources is pe

I haven't studied the stories of those companies that closely, but to be successful, you have to use the resources you have wisely. One of those resources is personal experience. You have to experience a problem to know how to solve it; and the problem isn't always as serious as being homeless. 37signals built their own Project Management platform, for example.