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).
DisplayFusion - DisplayFusion will make your multi-monitor life much easier.
Hammerspoon - This is a tool for powerful automation of OS X.
Ultramon - UltraMon is a piece of software built to help with the management of multiple screens on the same computer system. Without software like this, taking full advantage of an expanded desktop space can be difficult.
Spectacle App - Move and resize windows with ease.
Dual Monitor Tools - Download Dual Monitor Tools for free. Tools for Windows users with dual or multiple monitors. Tools for Windows users with dual or .