Talk to people. Really, that's how it starts. There are niches you won't even know exist until someone mentions that they have a problem doing X, or that Y is tedious and they spend 5 hours each week doing it.
Many of these niches are technologically very simple. e.g, there's someone I used to talk to online who makes a software package for manufacturing that consists of little more than basic geometry and a good UI. To a customer base that hates math and needs to do certain calculations frequently, that $29.95 program is perfect.
Many of these niches are technologically very simple. e.g, there's someone I used to talk to online who makes a software package for manufacturing that consists of little more than basic geometry and a good UI. To a customer base that hates math and needs to do certain calculations frequently, that $29.95 program is perfect.