Notifo was around two or so years ago, and I believe it was a startup that went through ycombinator, designed to be a "central notification center". It worked quite well for the short while I was using it.

They didn't take off though, and after saying they couldn't afford to keep servers running much longer, became silent. Any decent message notification system would require integration, so there is definitely an area left open.

Well a little ddg-ing and I got my answer. Looks like notifo is no longer.

Thanks for taking the time to check up on it. Also, I love DDG, but I haven’t found an appropriate verb to describe the action yet. So far, I’ve been using ‘duckducking’.