Penc is described as «window manager app for macOS designed for use with the trackpad. It lets you use trackpad gestures along with the Command key to move, resize and snap windows to the screen» and is a Window Manager in the os & utilities category. There are more than 50 alternatives to Penc for a variety of platforms, including Mac, Windows, Linux, PortableApps.com and MacPaw Setapp. The best alternative is Rectangle, which is both free and Open Source. Other great apps like Penc are AquaSnap, WindowGrid, BetterTouchTool and altdrag.