... Is to recommend, personally, that you opt for traditional gutters.
I admit the idea is novel. However, water droplets falling from 10+ feet in height will still erode the ground below, and NOT 'route' the water away from the foundation. These are the 2 main reasons for installing gutters.
IMO, the only way I'd opt for a 'gutterless system' is if I lived where it didn't rain. (If there's such a place, I'm not there.) Others may 'disagree' but that's my opinion.
Oh, to answer your question directly, I can say I've seen them but I honestly don't know any companies that make them. You might want to read about Seam or Seamless Gutters. There's a few 'mentions' about gutterless systems so read the entire article for the ENTIRE 'perspective'. I wish you well.