AquaSnap - Too many windows on your screen? Stop wasting your productivity.
Magnet Window Manager - Magnet Developers
Shiftit - fikovnik has 62 repositories available. Follow their code on GitHub.
Spectacle App - Move and resize windows with ease.
GridMove - GridMove - A window management tool that can quickly arrange your windows into desktop grids.
Moom - Move your mouse over the green zoom button in any window, and Moom's mouse control overlay will appear (as seen in the above animation).