DisplayFusion - DisplayFusion will make your multi-monitor life much easier.
WindowGrid - Quickly and easily layout windows on a dynamic grid using just the mouse.
Sizer - Sizer is a freeware utility that allows you to resize any window to an exact, predefined size.
Mizage Divvy - Divvy is an entirely new way of managing your workspace.
AutoSizer - Automatically maximize and resize your programs. Control their size, position, and even set them as Always On Top.
Rectangle - Window management app based on Spectacle, written in Swift.