Resettle
Puts windows back when you reconnect your monitors.
About Resettle
Resettle learns the window arrangement for each display setup you use, such as home, office or laptop alone, and restores it when that setup returns. It tells identical monitors apart, moves full-screen windows too, and can reopen apps that are missing.
Questions about Resettle
How much does Resettle cost?
Resettle is paid software, bought up front from getresettle.com.
Where can I download Resettle for Mac?
Download Resettle from the developer's website (getresettle.com). MacWorthy links only to official sources.
What are good alternatives to Resettle?
Other windows & desktop apps for Mac worth a look are Rectangle (open source), Magnet (one-time purchase), Moom (one-time purchase) and Loop (open source).
Other windows & desktop apps like Resettle
Rectangle
Window snapping with keyboard shortcuts.
Magnet
Snap windows into place by dragging.
Moom
Save and restore entire window layouts.
Loop
Window management with a radial menu.
Swish
Window control with trackpad gestures.
Dockaroo
A separate Dock for each display and Space.
Split
Side-by-side windows that resize together.
Tangrid
Automatic tiling with saved layouts per Space.