This is a complete non-answer. Something like "advertise in the newspaper," "cold-call random companies and ask if they need any software," "try to network at indsustry conferences for some chosen sector you want to implement software for," etc. would be examples of real answers. Of course, I'm sure someone with expertise in this would have much better advice than the made-up answers I just gave.
Small software companies often barter with local old-school advertisers and trade custom software products for exposure in the local marketplace. They used to trade for web apps and line-of-business software, but as you might imagine, mobile apps are the currency of the small software companies today.
