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).
Unity - The multiplatform game creation tools for everyone.
Hammerspoon - This is a tool for powerful automation of OS X.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Spectacle App - Move and resize windows with ease.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.