There are LOADS of companies like this. I run a few small ones myself that generate good revenue. Software-related is our www.sourceguardian.com site. Like m

There are LOADS of companies like this. I run a few small ones myself that generate good revenue. Software-related is our www.sourceguardian.com site. Like most things we solved a problem for our own needs and then turned it into a product. We have a healthy income from this which isn't far from being 'passive income'. My suggestion would be to look at a problem that hasn't been solved, or hasn't been solved well. We pick niche markets for what we do and that works well for us. I know of many companies like this.