www.getapp.com. Search any business term (eg, Procurement) and add "Management" + "SaaS" or "Cloud" or "Software" and you will find a wide array of companies that I bet no one here has heard of.

And a lot (including my app) that plenty of people will have heard of. I do agree though, there's a lot of apps in that directory and elsewhere that will end up being well known (or at least acquired) in the next 5-10 years.

The network (cloud) is where you sell your consumer or enterprise application now, not Windows.