Cant do without Divvy.

Window management has barely changed in 30 years.
Features like Spaces really come into their own when you can set up a separate workspace in each.
Divvy makes it window placement effortless. Its so intuitive, you dont even think about it. Only when setting up a new computer did I realize how much I miss Divvy.
Stop cursing at your mouse and instead Divvy up your screen.

Medium Bear about Divvy - Window Manager, v1.2.4