Cosurf - A browser for two on iPad
Magnet Window Manager - Magnet Developers
windOCD - Put Mac windows in their places!
Spectacle App - Move and resize windows with ease.
Mue - Fast, open and free-to-use new tab page for modern browsers.
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).