> GPLv3 or later (with proprietary driver clarification)
What's that parenthetical mean?
Looks like it's explained here: https://github.com/charlotte-os/Catten/blob/main/License/cla...
Specifically, "Users may link this kernel with closed-source binary drivers, including static libraries, for personal, internal, or evaluation use without being required to disclose the source code of the proprietary driver.".
I've never used it so can't speak from any experience, and unfortunately it doesn't seem particularly active (and doesn't mention a current status anywhere), and doesn't have a license, so shrug. When it's been posted here (https://news.ycombinator.com/item?id=40211891), people seemed pretty excited about it.