Perfect window manager for my needs!
I’ve been using Divvy for years. It does exactly what I need it to do, which is allow me to create global shortcuts to quickly arrange windows. Sounds simple, but it’s a fundamental part of how I work. The grid layout is intuitive, and when I bought a laptop with a smaller screen I was happy to find that you can add rows/columns, giving you fine-grained control of window sizes. I was devastated when an update to OS X took the app out of commission, but the devs released a fix in less than two days! What more could you ask for?
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Divvy - Window Manager