Adam Tervort
Adam Tervort reviewedMagnet 2.0Window manager for Mac
 RecommendedPros: 

Easy to use, great keyboard shortcuts

Cons: 

The snap-to settings can be a bit too aggressive

This is one of the first apps I install on Mac. Using keyboard shortcuts to manage the size of windows is amazing, the kind of thing macOS should have natively.

Adam Tervort has used this product for one year.