Today I learned that Pop!_OS, the Linux distro developed by System76, almost makes up for its silly name by shipping with a very nicely done auto-tiling Gnome shell extension (available at pop-os/shell):
 
Alternatives for macOS
- Magnet does almost the same thing on macOS, and if it supported saving pre-defined window layouts I would switch away from Moom.
- Rectangle is a Swift-based variant with snap areas
- Amethyst is likely the best tiled window manager for the Mac, but the default keyboard bindings are somewhat annoying after years of Moom.
- The LG Screen Manager application also does that, although they don’t actively advertise it.
Alternatives for Windows
PowerToys for Windows 10 includes FancyZones, which lets you define tiling zones.
 Rui Carmo
 Rui Carmo