macOS WM Directory
I never really think of macOS as an OS that has swappable window managers -- and I think that's correct for the most part -- but there are some neat ways of better managing windows. Here's a handy list to explore.
Public
MacsyZones, FancyZones for macOS
Very interesting-looking app aimed at window layout on macOS. While macOS has that sort of stuff built in now, this seems to go way beyond that.
Wins
Generally I'm a fan of and use Magnet; but this looks cool and is worth remembering if I ever want to try something else out.