Recently I wrote my own and now use that daily instead, which supports similar functionality (alt+drag) but also "zooming" in/out and panning around the desktop
I've used AltSnap but always found it a bit buggy and bloated with options, my project is extremely opinionated and without any configuration right now, but it changes the system cursors to match what's happening and works better with multiple monitors (you can snap windows between monitors)
DPaZ looks interesting :D