Ask HN: How do I get freelance developer jobs?
I guess it depends on what kind of software you want or can develop. I just started freelancing as web and hybrid app developer this year and what works for me is going to meetups, especially startup/entrepreneurship meetups. There are always founders there looking for developers. 
For me, this is the place to collect leads. And it's pretty easy, too, because developers are rare. If you tell them your a developer, the founders who are looking for one will probably approach you.