Understand how a niche website works. A niche website focuses on very targeted, specific information. The content must be specific, useful and interesting to your target audience. Successful niche websites get anywhere from 1,000 to 10,000 visitors per month. You build content on a particular keyword, and you make passive income with Google Adsense or through affiliate links.
If you are a software developer of course the internet is your strongest marketing platform. There is a large market for software on the internet. All you need to do is to look for a task in the IT world and then build a software to help simplify the task. For example; you can develop a software that will help people manage their clientele base (CRM software), you can develop software that will help people manage their payrolls, accounts, online files et al.